既然你已经长大了，就必须自己做这件事。

Now that you have grown up, you must do it by yourself.

youdao

既然你已经许诺了，你就要这么做。

You made a promise, so you have to do it.

youdao

既然你已经许诺了，你就要这么做。

You made a promise, so you have to do it.

youdao