方法：研究的群体由荷兰的9家大劳力公司中从事体力劳动的工人组成。
Methods. The study population consisted of workers in physically demanding jobs from 9 large companies located throughout the Netherlands.
年青工人的短缺对于中国的企业家来说令人头疼，他们需要工人们长时间从事体力劳动，这些劳动需要准确、良好的视力。
The shortage of young workers is a headache for Chinese factory bosses, who need workers that can put up with long hours and work that demands physical strength, precision and good eyesight.
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