The pleurae are serous membranes, which mean they secrete a lubricating fluid, called serous fluid.
浆,这意味着它们可以分泌润滑液体,即浆液。
The pleurae are serous membranes, which mean they secrete a lubricating fluid, called serous fluid.
浆,这意味着它们可以分泌润滑液体,即浆液。
Gear must be properly lubricated.
齿轮必须适当地加油润滑。
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