名词
中文翻译：手动润滑
同义词：
['manual lubrication', 'manual oiling']
例句：
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1. The car needs manual greasing before it can start.
这辆车需要手动润滑才能启动。
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2. The mechanics had to manually greasing the gears before they could be turned.
机械师们不得不手动给齿轮加油才能转动它们。
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3. The old car needed manual greasing because it had been sitting for a long time.
这辆旧车需要手动润滑，因为它已经停放很长时间了。