现在我必须去做我的工作了。

But I must go on with my work.

youdao

我先做给你看如何击球，然后你必须照我的示范去做。

I'll show you how to hit the ball and then you must copy [follow] my example.

《新英汉大辞典》

可能有一些别的更简便的方法来实现我想要的，但这样去做，我又必须虚席一些更新的东西——这意味着会浪费大把时间。

There might be other ways of doing what I do that are easier, but in order to do them I have to learn something new - which is time consuming.

youdao