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Why is the four-dimensional salary in China so low?

the work is difficult and the working hours are short. In the recruitment announcement of China Siwei Surveying and Mapping Technology Co., Ltd., we can know that the positions recruited by the company are surveyors, rendering topographic maps, which is extremely difficult, and the daily workload is not large, and the working hours are short, so the salary will be low. China Siwei Surveying and Mapping Technology Co., Ltd. is registered in Zhichun Road, Haidian District, Beijing.