There was no one at home and he felt alone.

家里一个人也没有，他感到很孤独。

youdao

He felt alone and happy and absolutely free.

他只感觉到他自己，只感觉到快乐和纯粹的自由。

youdao

He felt unsafe and alone.

他感到又危险又孤单。

《牛津词典》

He felt Spain should be left alone to honor its promises to the Cuban people.

VOA: special.2010.07.08

Kadyrbayev said he took Tsarnaev's laptop computer too, because he felt Tsarnaev's roommate might get suspicious if they left with the backpack alone, the affidavit states.

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