For instance, a crack in the branch of a tree will not lead to the felling of the tree in the same way that a broken ankle will not lead to collapse of the whole leg.
例如,树枝一处断裂不会导致整棵树的倒地,同样,脚踝扭伤不会废掉整条腿。
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That's the problem lawmakers are wrestling with amid hearings and federal investigations of the Upper Big Branch mine blast in West Virginia and the BP oil rig collapse in the Gulf of Mexico.