重点讲解：

1.speed up加速
You notice that your breathing has speeded up a bit...
你注意到自己的呼吸加快了一些^hm&p)kd=ReUh-)z,59。

2.shut down关闭；停业

Smaller contractors had been forced to shut down...
规模较小的承包商已被迫歇业mH5k+@7yJ#jEn。