内胆里面设置有滤网，在外壳的上盖上，还设置有变速齿轮箱。
The filter screen is arranged inside the inner liner, and the speed change gear box is arranged on the upper cover of the shell.
发电齿轮箱的外壳包覆驱动轴。
The casing of the electricity generating gear box covers the driving shaft.
发电齿轮箱的外壳包覆驱动轴。
The casing of the electricity generating gear box covers the driving shaft.
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