Great efforts lie behind the seemingly effortless success.
You must work so hard that you can deal with things easily
You must work hard to look relaxed.
Only when you work hard can you do it wihtout any difficult 这是一个倒装句
You must work so hard that you could do it easily (or that you look comfortable on it) at last.
You must work very hard so that you can read it without difficulty.
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