Those fears, it is argued, stem from a double squeeze on America's middle class.

这些担心，被认为是由于美国的中产阶级遭受双重打击。

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Bug patterns often stem from confusing features of the language or the class library; this bug pattern stems from the somewhat counterintuitive fact that RuntimeException extends Exception.

bug模式通常源自语言的模糊功能或类库；出现此bug模式是因为RuntimeException扩展了Exception，这稍微有点违反常理。

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In the field of stem cells, China is showing that it can do world-class science.

在干细胞研究方面，中国已经达到世界先进水平。

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Rising Stem: Valves shall be Class 125 and 200 psi CWP, rising stem, union bonnet, solid wedge and manufactured in accordance with MSS-SP 80.

明杆：这种阀门工作压力是125磅级和200psi冷水压力，明杆，管接头式阀盖，实心楔板，并按照美国阀门和管件制造商标准化协会MSS-SP80标准制造。

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Rising Stem: Valves shall be Class 125 and 200 psi CWP, rising stem, union bonnet, solid wedge and manufactured in accordance with MSS-SP 80.

明杆：这种阀门工作压力是125磅级和200psi冷水压力，明杆，管接头式阀盖，实心楔板，并按照美国阀门和管件制造商标准化协会MSS-SP80标准制造。

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