However, it's worth repeating: Although hormonal processes cause some muscle changes over the course of your life, shrinking muscle mass and decreasing strength aren't caused by age alone.

然而，值得重申的是：尽管激素水平会导致肌肉发生变化，但是年纪变大并不是引起肌肉减少和肌力退化的惟一原因。

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Labor unions are throwing their political muscle behind lawmakers' efforts to overhaul immigration regulations, with the hope that organizing immigrant workers can swell unions' shrinking ranks.

WSJ: Unions Seize on Immigration Debate