At a railway crossing not watched by any one, warning marks shall be set up at a certain distance from the crossing.

无人看守的铁路道口，应当在距道口一定距离处设置警示标志。

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Inspection distance between draught marks and keel plate after marking out.

划线后检查吃水标尺至平板龙骨之间的距离。

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As a means to score in the distance in basketball competition at present, a ball of three marks occupies a position of fair importance.

三分球作为远距离得分手段在当代篮球比赛中占有相当重要的地位。

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