题目内容
v. to take a firm hold of sb/sth; to understand sth completely
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n. the back part of the foot below the ankle
v. to become hard, and often turn to ice, as a result of extreme cold; to make sth do this;
adj. deserving respect and admiration; showing high moral standards
n. the parts of a building or an object that support its weight and give it shape; a set of beliefs, ideas or rules that is used as the basis for making judgements, decisions, etc.
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