Perhaps the most fundamental is an abundanceofelements that can be easily boiled out of hot rock.
也许最基本的一点就是水星大量拥有从沸腾岩浆中便可轻易获得的元素。
2
The rate at which massive stars form drops sharply as you venture outward from the Milky Way’s center, and the abundanceof heavy elements falls with them.
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。
3
Metallicity is a measure of the relative abundance in a star ofelements other than hydrogen and helium.