| 单词 | activity |
| 释义 | activity /ak tiv"i tee/, n. , pl. activities. 1. the state or quality of being active: There was not much activity in the stock market today. He doesn't have enough physical activity in his life. 2. a specific deed, action, function, or sphere of action: social activities. 3. work, esp. in elementary grades at school, that involves direct experience by the student rather than textbook study. 4. energetic activity; animation; liveliness. 5. a use of energy or force; an active movement or operation. 6. normal mental or bodily power, function, or process. 7. Physical Chem. the capacity of a substance to react, corrected for the loss of reactivity due to the interaction of its constituents. 8. Physics. a. the number of atoms of a radioactive substance that disintegrate per unit of time, usually expressed in curies. b. radioactivity. 9. an organizational unit or the function it performs. [1520-30; ( < MF) < ML activitas. See ACTIVE, -ITY] |
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