单词：delivery work
delivery work的用法和样例：
例句
- The first law tells us that work output cannot be produced without an equivalent amount of energy input.第一定律告诉我们，如果没有等当量的能量输入，就不可能产生输出功。
- In the absence of frictional energy dissipation, input work and output work are equal.没有摩擦力所引起的能量消耗时，输入功等于输出功。
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