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。
《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。
《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。
《柯林斯高阶英汉双解学习词典》
In fact I am supposed to be on duty now, instead of wasting your time here.
实际上我这个时候就应该在岗位上值班, 而不是在这里浪费大家的时间.
网络文摘精选
A young fellow turned seventeen and still wasting your time on such nonsense as this!
十七八岁的孩子,还干这些没出息的玩意儿!
子夜部分
Then , when he woke up he would hate himself for wasting so much time.
及至睁开眼,一天的工夫已白白过去,他又后悔,自恨.
汉英文学 - 骆驼祥子
Stop wasting your time and spirit. You can't get what does not belong to you.
你不要再枉费心机了, 不属于你的东西终究是得不到的.
互联网摘选
但是，你可以通过买一些公司股票的方式来投资，这些公司的产品和服务往往是“鼓励”和“教唆”人们浪费时间的。
互联网摘选
虽然解锁码能提高安全系数，但许多用户都不愿意在登陆前花几秒钟的时间来输入密码。
互联网摘选
