We made dinner by ourselves.

我们自己做了晚餐。

We went on the trip by ourselves.

我们自己去旅行了。

We cleaned the room by ourselves.

我们自己清理了房间。

We solved the problem by ourselves.

我们自己解决了这个问题。

We completed the project by ourselves.

我们自己完成了这个项目。

Eating food not cooked by ourselves can cause serious consequences.

吃不是自己煮的食物会导致严重的后果。

We should develop the habit of doubting, and the ability to decide by ourselves.

我们应该养成怀疑的习惯，培养自己做决定的能力。

We finished the work by ourselves.

我们自己完成了这项工作。

Anyway, we had to try to fix the stupid car by ourselves.

不管怎样，我们不得不试着自己修理这辆破车。

We can drive by ourselves with my brother.

我们可以和我哥哥一起自驾游。