你越往星系中心走，大质量恒星形成的难度就上升得越快，重元素的丰度也随之下降。
The rate at which massive stars form drops sharply as you venture outward from the Milky Way’s center, and the abundance of heavy elements falls with them.
瑞丰五金开关插座品牌必将越来越被市场认可，让客户信赖！
Ruifeng hardware switch socket brand will more and more recognized by the market, so that customers trust!
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