题目内容
n. a group of animals of the same type that live and feed together; v. to make animals move together as a group
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n. a line that separates two countries, etc.; the limit of sth, especially the limit of what is known about a particular subject or activity
v. to recognize sb/sth and be able to say who or what they are
v. to take a firm hold of sb/sth; to understand sth completely
n. the back part of the foot below the ankle
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