题目内容
n. a large organ in the body that cleans the blood and produces bile
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adj. unable to walk well because of an injury to the leg or foot
n. the powerful effect that sth. has on sb./sth.; the act of one object hitting another;
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
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