This paper introduces mechanism, research methods and main results about microbubble dray reduction.
该文介绍了微气泡降阻机理 、 研究方法和重要结论.
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A dray is a type of horse - drawn vehicle.
雪橇是一种马拉的交通工具.
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She stood doggedly in checkout lines; she toiled like a dray - horse up the Hill back home.
她顽强地支撑着排在付款的队里; 她像拖载重物的老马艰难地爬上山回家.
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