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1.slow down 减速，放慢速度
Slow down and walk for one minute.
最后，逐渐慢下速度，走一分钟。
2.spring up 出现；涌现
But even as some obstacles are removed, new ones spring up.
但即使有些障碍已经被扫清，新的障碍还会涌现。
3.cool off 冷却
I stopped to let the car cool off and to study the map.
我停下车，让汽车发动机冷却一下，同时查看一下地图。
