比如对前缀来说，咱们就得能删掉头部，然后在尾部添加新词。
For the prefixes, we need to be able to remove words from the beginning and add to the end.
在几分钟的沿着格栅的当当声后，我们到达了机器的尾部，工作人员正在给机器添加新的设备系统。
After clattering along the grating for several minutes, we reach the back of the machine. The pipe crew is busy adding new plumbing.
在几分钟的沿着格栅的当当声后，我们到达了机器的尾部，工作人员正在给机器添加新的设备系统。
After clattering along the grating for several minutes, we reach the back of the machine. The pipe crew is busy adding new plumbing.
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