自考英语阅读（二）词汇汇总（UNIT5-12） ... extra a. beyond what is usual or necessary 额外的 measure v. find the size， length， amount， etc. 量；测量；估量 messenger n. a person who brings one or more pieces of information 送信者；使者 ...
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The stones each measure one ton, which makes them difficult to transport by truck.
每块石头有一吨重，用卡车运输很困难。
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With commercial airplanes we usually use a measure called cost-per ton-mile.
随着商用飞机，我们通常会用一个衡量所谓成本每吨英里。
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