the shell (metal casing) in which a train of gears is sealed
例句
用作名词 (n.)
Modal frequency and vibration response of the gear box are computed by structural FEM with a 3-D FE model. 建立齿轮箱三维有限元模型，采用结构有限元法计算齿轮箱模态频率和振动响应。
The paper calculates and analyses the problem of vibration and noise of subway gear box with the combination of structural FEM and acoustic FEM. 摘要运用结构有限元法和声学有限元法，对地铁某型号齿轮箱振动与噪声问题进行计算分析。
美
