从句型方面看，简单明了的祈使句、无主句和省略句是常用句型，如切勿回返(No Re-entry)、注意行人(Beware Pedestrian)、注意乘梯安全(Please Watch The Steps)等。此外，文字与通用标志共用也符合简洁性原则。
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no re-entry
没有返回
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But the pictures are being examined by engineers back at mission control to ensure there is no damage that could jeopardise the shuttle's re-entry through the Earth's atmosphere.
BBC: Shuttle crew welcomed aboard ISS
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