进入“最后”一关的点越少，修改、校对时，它们被忽略过去的几率就越小。
The fewer points go into the "later" box, the smaller the chance they will pass unnoticed during editing and proofreading.
测量方法简便，不需校对零点，有利于自动化，提高了测量精度。
Said method is simple, no need for correcting zero point, easy automatization and improves measuring precision.
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