| 单词 | helium |
| 释义 | helium (once / 4835 pages) n The element helium is a colorless, odorless gas. Because helium is lighter than air, it's commonly used for filling balloons to make them float. Because of the effect that helium has when lightweight objects are filled with it — making party balloons and parade floats hover in the air as if by magic — it's one of the best-known elements. Helium is almost always a gas, unless it's subjected to very extreme conditions, and it's been used at various times in military airships and weather balloons. The word helium comes from a Greek root, helios, or "sun," because it was initially discovered in the sun's spectrum. WORD FAMILYhelium USAGE EXAMPLESThe investigation narrowed in on three helium containers within the second-stage liquid oxygen tank. New York Times(Jan 02, 2017) The company determined the 2015 accident was caused by the rupture of a substandard metal piece supporting a pressurized helium vessel. Wall Street Journal(Jan 02, 2017) Helium balloons declaring “Congratulations” floated above the long table. Washington Post(Jan 01, 2017) n a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) Syn|Hyper He, atomic number 2 chemical element, element any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter argonon, inert gas, noble gasany of the chemically inert gaseous elements of the helium group in the periodic table |
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