题目内容
v.to protect sb./sth from attack; to say or write sth in support of sb./sth. that has been criticized
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v.to keep sb./sth. inside the limits of a particular activity, subject, area, etc. ; to keep a person or an animal in a small or closed space
adj. of a good enough standard or quality; acceptable to people in a particular situation
n. the length of time that sth. lasts or continues
v. to ask an amount of money for goods or a service; to pass electricity through sth. so that it is stored there
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