Success never seems to come but through hard work, often physically demanding work at that.

成功不通过努力工作似乎是无法取得的，而且往往是很耗费体力的工作。

《柯林斯英汉双解大词典》

Housekeepers perform the most physically demanding work necessary to operate a luxury hotel.

清洁工们从事着最劳累的工作，这也是要运营一所豪华酒店最重要的工作。

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Actual retirement of many men and women actually occurs at age 62, despite the decline in physically demanding work, and the improvements in health.

实际上许多男性和女性劳动者的退休年龄是62岁，尽管体力劳动已经减少而健康状况已经提升了。

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Physically demanding work was defined as work involving repetitive lifting, load-carrying or other significant physical exertion.

BBC: Heavy work 'bad for childbirth'

In 1960, half of the native-born men in the labor force were high school dropouts happy to do physically demanding, low-skilled work.

CNN: Key to immigration reform: Worker visas

Pregnant women whose job is physically demanding - or who do shift work - could face more childbirth problems, say scientists.

BBC: Heavy work 'bad for childbirth'