A bar of iron continually ground becomes a needle.

只要功夫深,铁杵磨成针。

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If you don't like what you're doing, you can always pick up your needle and move to another groove.

如果你不喜欢你正在做的事情,你可以随时拿起你的针,移动到另一个槽。

Rust consumes iron, and envy consumes itself.

锈能消耗铁,嫉妒能消耗自己。

Iron sharpens iron; scholar, the scholar.

铁磨铁,磨学者,学者。