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1·Car sensors that detect the distance between your bumper and the car in front of you can prevent a sweep of brake-slamming that can tie up traffic, for example.

比如说，能够检测你的汽车保险杠与前方汽车距离的感应器，可以防止可能造成交通停滞的紧急刹车。

2·The heavy snowstorm caused a tie-up of traffic.

大 风雪 造成了交通的暂时停顿。