名词
中文翻译：数量
同义词：
['quantity', 'magnitude', 'measure', 'quantity of', 'amount']
例句：
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1. The teacher asked us to measure the length of the rope.
老师让我们测量绳子的长度。
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2. The volume of the gas is 20 liters.
气体的体积是20升。
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3. The amount of money we spent on the trip was $500.
我们在旅行中花费了500美元。