All parties need to explain the background and evidence for their policies.

各党都必须解释其政策背景并提供证据。

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In addition the coach should explain their own background and their goal (s).

除此之外，敏捷教练应该介绍一下自己的背景和目标。

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I will explain the background details first.

我先来介绍一下背景情况吧。

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Explain the social and cultural background of Guxian.

阐释古县的社会文化背景。

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Explain the social and cultural background of Guxian.

阐释古县的社会文化背景。

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