One could carry this television by oneself.

这台电视可以自己搬。

And now for " by oneself." " By" is a preposition.

现在讲by oneself。by是介词。

One doesn't do it by oneself.

一个人不能独自做这件事。

In such a case, studying by oneself is crucial to improve your learning efficiency.

在这种情况下, 自学对于提高你的学习效率至关重要。

It is lonely living by oneself.

一个人住很孤独。

America is a nation known for the idea of making things by oneself.

5. 美国是一个以自己制造东西的理念而闻名的国家。

The core of all these approaches is developing the capacity to think for oneself by learning from others.

所有这些方法的核心是通过向他人学习来培养自己思考的能力。

" Alone" , instead of saying " alone" , you could say: " by oneself" , " on one's own" , " by themselves" .

“独自”，替代这个词，你可以说：“一个人”，“自己”，“他们自己”。