The engineer has introduced useful machineries to save labour in the power plant

游客2023-12-11 64

问题 The engineer has introduced useful machineries to save labour in the power plant.

选项

答案 machineries machinery

解析 machinery是一个集体名词，表示机器的总称，不能用作可数名词，因此也没有复数形式。

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