螺杆的外径为固定值，螺杆的沟槽深度(the depth of flight)从进料区到计量区起点逐渐递减，沟槽深 度的变化使塑料相对于料筒内径产生压缩，造成剪切热，提供熔化塑料的主要热量。
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As I have been writing and talking about space flight for the best part of 20 years, a sudden switch of interest to the depth of the sea doer seem peculiar.
在20年的绝大部分时间里，我一直在撰写和谈论太空飞行，突然对深海探险者的兴趣发生了转变，这似乎有些奇怪。
As I have been writing and talking about space flight for the best part of 20 years, a sudden switch of interest to the depth of the sea does seem peculiar.
在20年的绝大部分时间里，我一直在撰写和谈论太空飞行，突然将兴趣转向海洋深处，确实显得很奇怪。
The mind wakes up, and out of the depth of silence there is the enchantment of meditation, which no imagination or flight of fancy can ever bring about.
心灵醒来，从深深的寂静中就产生了迷人的冥想，而这是想象或者异想天开永远无法实现的。
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