技术制图。几何形位公差的符号。比例和尺寸。
Technical drawings. Symbols for geometrical tolerancing. Proportions and dimensions.
空气动力学性能是否能在飞机的尺寸和速度上按比例放大，则是另外一件事情。
And whether any aerodynamic effects could scale appropriately for aircraft sizes and speeds is another matter.
最初人们认为，黑洞的尺寸和其宿主星系的大小是成比例的，但这个观点现在看来并不尽然。
Initial observations that the size of a black hole and the size of its host galaxy were matched are turning out to not always be the case.
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