... 长宽比 length breadth ratio 长深比 length depth ratio 啮合长度（齿轮），作用长度 length of action ...
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用这种方法研究了不同凹腔长深比、凹腔后缘倾角和不同燃料喷注方案对超声速燃烧火焰结构的影响。
Then the influence on flame structure of supersonic combustion of ratio of length and deep of cavity, obliquity of back edge of cavity and different schemes of fuel injection were studied.
行进小鼓的体积比一般为深套鼓乐团或用途的小鼓，往往在一英尺长的测量研究。
Marching snare drums are deeper in size than snare drums normally used for orchestral or drum kit purposes, often measuring in at a foot long.
三峡工程大坝泄洪深孔孔口数量多、尺寸大，且具有操作频繁、水头高、变幅大等特点。在技术设计阶段，对深孔长、短管方案进行过深入的比选研究。
The bottom release outlets of the Three Gorges dam are characterized by a considerable number of outlets, large size, frequent operation, high water head and great variation in water head, etc.
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