在开始有记录之前，我们只有主要根据年轮和冰芯重建的“代理记录”，还有一些不完整的书面记录作为补充。

For the time before records began, we have only "proxy records" reconstructed largely from tree rings and ice cores, supplemented by a few incomplete written accounts.

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为使社交媒体在你的社交生活中有助于心理健康，它应当作为现有健康社交网络的一个补充。

In order for it to play a psychologically healthy role in your social life, social media should supplement an already healthy social network.

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这种疗法可以作为一个有效的技巧，作为传统心理疗法的补充。

The therapy can be a useful technique to complement traditional forms of psychotherapy.

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