浪费时间,蹉跎岁月;

You're wasting your time trying to explain it to him (= because he will not understand) .
你跟他解释是在浪费时间。
来源:《牛津高阶英汉双解词典》We used to grumble that we were wasting time learning a dead language.
我们过去常常抱怨自己是在浪费时间学一门死语言。
来源:《柯林斯高阶英汉双解学习词典》Peter announced that he had no intention of wasting his time at any university.
彼得宣称他无意在任何一所大学浪费时间。
来源:《柯林斯高阶英汉双解学习词典》
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