Hanging lines for the rig tongs must be inspected at regular intervals and be in good working condition.
必须定期检查大钳悬吊绳，使其处于良好的备用状态。
Many are hit by trains or cars, or electrocuted by low-hanging power lines.
许多大象被火车或汽车所撞，或因低挂电力线路触电。
The dashed lines hanging from the boxes are called object lifelines, representing the life span of the object during the scenario being modeled.
从各个框垂下来的虚线称为对象生命线，表示在对方案建模期间对象的生命跨度。
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