单词 | reaction |
释义 | re·ac·tion ![]() n. 1. a. A response to a stimulus. b. The state resulting from such a response. 2. A reverse or opposing action. 3. a. A tendency to revert to a former state. b. Opposition to progress or liberalism; extreme conservatism. 4. Chemistry A change or transformation in which a substance decomposes, combines with other substances, or interchanges constituents with other substances. 5. Physics A nuclear reaction. 6. Physics An equal and opposite force exerted by a body against another body that is exerting a force on it. 7. The response of cells or tissues to an antigen, as in a test for immunization. |
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