This paper introduces mechanism, research methods and main results about microbubble dray reduction.

該文介紹了微氣泡降阻機(jī)理 、 研究方法和重要結(jié)論.

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A dray is a type of horse - drawn vehicle.

雪橇是一種馬拉的交通工具.

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She stood doggedly in checkout lines; she toiled like a dray - horse up the Hill back home.

她頑強(qiáng)地支撐著排在付款的隊(duì)里; 她像拖載重物的老馬艱難地爬上山回家.

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