| 释义 |
footprint|ˈfʊtprɪnt|
The print or impression left by the foot; spec. in Geol. a fossilized one.
1552Huloet, Fote prynte, or the printe of the fote, peda. 1623Cockeram 1, Traces, the feet-print of rauening beasts. 1850Lyell 2nd Visit U.S. II. 304 Certain fossil foot-prints of a reptile said to have been found in strata of the ancient coal-formation. 1865Tylor Early Hist. Man. 115 The typical case is the sacred footprint of Ceylon. 1888Burgon Lives 12 Gd. Men II. v. 25 Their footprints in yesterday's snow were all still there.
fig.1674Playford Skill Mus. i. xi. 38 Of which I do intend in this my Discourse to leave some foot-prints. 1839Longfellow Psalm of Life vii, Leave behind us Foot-prints on the sands of time.
Hence ˈfoot-print v. trans., to mark with footprints.
1850Mrs. Browning Poems I. 201 Pavement fair, The antique wood-nymphs scarce would dare To footprint o'er.
Add:2. a. Astronaut. The area within which a spacecraft is intended to land. (temporary.)
1965Science Year 321/1 Footprint, the proposed landing area for a spacecraft.
b. The ground area beneath a vehicle or aircraft that is affected by the noise or pressure of its operation; spec. (a) (in full noise footprint) the area in which the noise exceeds a specified level; (b) the area of contact between a tyre and the ground.
1967Jane's Surface Skimmer Systems 1967–8 67 (caption) The machine carries electronic mine detection equipment out in front of a jeep... The footprint pressure is thought to be sufficiently low to prevent detonation of any normal mine. 1971Aeronaut. Jrnl. LXXV. 596/1 The noise footprint on the ground is restricted to a small area beneath the aircraft. 1971Physics Bull. Nov. 657/2 The 90 PNdB ‘footprint’ associated with a large compound helicopter..during take off and landing would be of the order of 1100 ft from the pad. 1977Time 31 Oct. 17/1 Many of the 500,000 residents of New York City and Long Island who live near the SST's sonic ‘footprint’ back the Emergency Coalition to Stop the SST. 1984Truckin' Life Jan. 48/3 The superior performance capabilities [of steel belted radial tyres] are:—..(e) Greater traction—improved braking—due to bigger footprint. 1986Aviation Week 20 Jan. 41/1 The aircraft is expected to have basically the same noise footprint as the passenger version. 1986Power Farming Oct. 47/2 (Advt.), Agricultural Radial Tyres have an increased footprint, providing lower soil compaction from the tyre. 1991Daily Tel. 25 Jan. 4/7 The ‘footprint’ of a B-52 bombing raid depends on the aircraft's altitude.
c. The area within which a broadcast signal from a particular source can be received.
1971IEEE Trans. Aerospace & Electronic Syst. VII. 235/2 This paper develops the expression for computing the footprint on earth (i.e. power density contours) of a satellite antenna. 1980Times 31 Jan. 17/5 The problem facing [Radio] Luxembourg is that their ‘footprint’..does not cover enough of Britain to make English language broadcasting economic. 1985Music 2 Feb. 15/4 Adjoining areas of advertising potential can be added to a [radio] station's ‘footprint’ without losing local relevance. 1990Screen Internat. 21–27 Apr. 18/1 Medium-powered satellites have a footprint which covers only a little more than the domestic frontiers, so for a true European evening on TV, it will take collaboration between the different satellite TV owners in the future.
d. Computing. The area of a surface (as a desk-top) occupied by a microcomputer or other piece of hardware.
1982Computerworld 27 Dec. 17/3 There will be a few major impacts. One area..is the introduction of terminals with smaller footprints that are designed for the executive's desk. 1983MicroComputer Printout Sept. 65/1 Some systems permit the unit containing the disks and central processor to be stood on the floor, which makes for a smaller footprint—the amount of desktop space a computer occupies. 1984Your Business Computer Feb. 22/1 The 150 has a footprint measuring less than a foot..on each side. 1991Observer 22 Sept. 11/3 (Advt.), A true desktop size with a footprint no wider than a sheet of A3.
▸ An environmental consequence of human activity in terms of pollution, damage to ecosystems, and depletion of natural resources. Cf. carbon footprint n. at carbon n. Compounds 3, ecological footprint n. at ecological adj. Special uses.
1979Park Service Concessions Policy, Hearings Subcomm. Parks, Recreation, & Renewable Resources (U. S. Cong. Senate Comm. Energy & Nat. Resources) 799 An alternate proposal that would remove environmental footprint from Yosemite Valley..would remove a number of buildings, consolidate service, and reduce somewhat the number of employees. 1988Oil & Gas Jrnl. 29 Feb. 23/2 No doubt exists that Prudhoe Bay oil field has indeed resulted in a 'footprint' on the tundra and that minor permit exceedences and small spills have occurred. 1994Equinox Aug. 15/2 State-of-the-art technology will allow the company to ‘significantly reduce the industry footprint’ of drilling. 1996Earth Matters (Friends of the Earth) Autumn 11/2 Take what environmentalists call the ‘global footprint’ of supermarkets—those planet-wide supply lines that bring us carrots from South Africa. 2003F. Buell From Apocalypse to Way of Life 148 The developed world creates more than its share of woe through the broadening footprint left by its economic machine. 2006N.Y. Times (National ed.) 17 May e12 (advt.) By lessening our environmental footprint, we'll lower costs. |