People engaged in heavy manual labor have higher X-ray detective rates than others engaged in light manual labor.
从事过重体力劳动者骨皮质增厚的X线检出率高于从事轻体力劳动者；
The cutter has replaced the lagging heavy manual labor and it's suitable for hotels, canteens, individual specialized household in food-processing etc.
它取代了落后的繁重手工劳动，适合宾馆、集体食堂、个体食品加工专业户使用。
In the 20th century, science and technology on the human contribution to one of the most important is to liberate from the heavy manual labor people have plenty of leisure time.
20世纪科学技术对人类做出的最重要贡献之一，是将人类从繁重的体力劳动中解放出来，使人有了充裕的休闲时间。
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