His move to the left was not a sudden leap but a natural working out of ideas.
他左倾的转变并非突然，而是思想发展的自然结果。
If you had a motor here that was causing a paddle to move up and down you could cause waves to form at one end of the tank and move from left to right.
如果这里有一个马达，使桨上下移动，就可以在水槽的一端形成波浪，从左到右扩散。
The implements can talk back, telling the tractor that it's going too fast or needs to move to the left.
这些工具会回应，告诉拖拉机它开得太快了，或者需要向左移动。
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