A line has length but neither breadth nor thickness.
线有长度，但既没有宽度，也没有厚度。
Thickness of slot plate has little influence on heat transfer for in line arrangement.
顺排时孔板本身的厚度对换热几乎无影响。
We can make adjustable focus to change line thickness.
我们可以制作可调节焦点来改变线宽。
We can make adjustable focus to change line thickness.
我们可以制作可调节焦点来改变线宽。
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