题目内容
n. the powerful effect that sth. has on sb./sth.; the act of one object hitting another;
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n. Something that happens in real life or in a story; an event, often of little importance.
n. the practical study of machinery; the science of movement and force
adj. connected with or using a person's ability to think in a logical way and understand things
n. a flash, or several flashes, of very bright light in the sky caused by electricity
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