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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Firstly, it provides vital information about the way that people evolved—information not always easily obtainable from excavated artefacts alone.

首先，它提供了关于人类进化方式的重要信息——仅从出土文物中很难获得这些信息。

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No matter how isolated you might feel and how serious the situation is, you should always remember that you are not alone.

无论你感到多么孤独，无论情况多么严重，你都应该记住，你不是孤身一人。

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After that, recall that price alone is not always the only, or even a major, consideration for consumers.

WSJ: Business Asia: Unearned Praise for Abenomics

Such appendages betoken an understanding that words alone do not always suffice, especially when a message's purpose is to communicate its author's power and importance.

WSJ: Lux in Arcana | Capitoline Museum | The Papacy's Private Papers | By Francis X. Rocca

Market constraints alone are not always enough to ensure good behaviour.

ECONOMIST: Free exchange: Fine and punishment | The