There are a lot of shortcomings in traditional optical leveling survey. It includes too intensive labor, low efficiency and difficult afterward data processing.

但传统的光学水准测量也存在着劳动强度大、测量效率低下、测量数据的后续处理不方便等缺点。

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"This labor not only takes lower wages,but accepts a standard of living so low that the American working man cannot compete with it."

VOA: special.2010.05.20

Minimum wage laws prevent employers from taking advantage of low-quality labor at low prices.

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Hard labor at low pay over a lifetime takes its toll on a person.

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It's clear to billions around the world that the Pope believes that, here on Earth, justice must be done for those who labor for low wages.

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