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。
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。
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。
Stem cell is a class of self-renewing and trap a potential of cell groups, it can self-renewal in long-term and has the ability of differentiation to form variety cells in certain conditions.
干细胞是一类具有自我更新和多向分化潜能的细胞群体，它能长期地自我更新，在特定的条件下具有分化形成多种终末细胞的能力。
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。
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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