elbow grease
noun [ U ] informal uk/ˈel.bəʊ ˌɡriːs/ us/ˈel.boʊ ˌɡriːs/
(体力上的)重活;费劲,苦干
a lot of physical effort
The polish needs a certain amount of elbow grease to apply. 要把这个擦亮得费不少劲。
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