Those who engaged in activities that were not intellectually challenging, either in a social group or alone, did not show such improvements.

那些参加了非智力挑战活动的人，无论是在社会群体中还是单独活动，都没有表现出这样的进步。

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Whether play occurs or not depends on the intention of the animals, and the intentions are not always clear from behaviors alone.

玩耍的发生与否取决于动物的意图，而这些意图并不总是仅从行为上就能看出来的。

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youdao

The United States is not alone. Commercial rents in Moscow,Hong Kong, Singapore and Mumbai have fallen thirty percent or more.

VOA: special.2009.09.04

But calculating it alone doesn't necessarily tell us whether or not it will just happened of its own accord.

但是计算这些物理量并不一定能够告诉我们,这些变化是否会自发的进行,而这正是我们想要做到的。

麻省理工公开课 - 热力学与动力学课程节选

What I've learned which I appreciate so much is just to be reminded that I'm not alone, even I felt alone a lot of the times.

我所学到的让我珍视的,是提醒自己并不孤单，即便很多时候我感到孤独。

普林斯顿公开课 - 人性课程节选

This is not -- personnel alone does not determine -- ask the Cleveland Cavaliers if personnel alone -- ask anybody, there are -- every team except the Lakers put together a team to win the NBA title, and only one did.

WHITEHOUSE: Press Briefing

Fiennes, who does not use Twitter, is not alone in his theory.

FORBES: No, Twitter Isn't Ruining the English Language

But it's not -- drilling alone will not solve this problem.

WHITEHOUSE: Press Briefing