If the set collar end hardness is lower than HRC40, should first on the end surface again a built-up welding hard alloy, after the polish repackaging.

如果固定环端面硬度低于HRC40，则应先在端面上重新堆焊一层硬质合金，经磨光后再装配。

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But they're hard to miss in foundering blue-collar and low-end service communities across the country.

但是在各地衰落的蓝领、低端服务行业中却十分明显。

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Men's difficulties are hardly evident in Silicon Valley or on Wall Street. But they're hard to miss in foundering blue-collar and low-end service communities across the country.

男人的困境在硅谷或华尔街表现得并不明显，但是在建立遍及全国的蓝领和低端服务社区时，他们是当仁不让的主力。

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They end in hooks which would have been linked together when the collar was worn.

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Wal-Mart stumbled a few years ago with a push into high-end fashion, instead of sticking with cheaper clothing that suited its blue-collar customers.

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Well, to that end, Radiation Shield Technologies has developed a full line of radiation-defeating garments (the thyroid collar being our favorite).

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