gnaw a file的用法和樣例：
例句
- It was the cold of his errand, a foot's errand.
這是因為這趟奔走肯定徒勞無功而感到發冷吧。
- We wasted all day on a wild-goose chase.
我們徒勞無功的浪費了一整天。
- To argue with such a marl is like beating the air.
跟這號人辯論是白費力氣。
- It is of no use boasting of being rich on a desert island.
在無人島上誇耀富有也是白費力氣。
以上內容獨家創作，受著作權保護，侵權必究
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