The pleurae are serous membranes, which mean they secrete a lubricating fluid, called serous fluid.
胸膜为膜,这意味着它们可以分泌润滑体,即。
The pleurae are serous membranes, which mean they secrete a lubricating fluid, called serous fluid.
胸膜为膜,这意味着它们可以分泌润滑体,即。
Gear must be properly lubricated.
轮必须适当地加油润滑。
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