| 释义 |
heavy elements短语⁷³¹⁴⁴
基本例句
重元素
For tens of millions of years, most have been far from the galactic disc where dust and gas resides, so heavy elements such as calcium should have sunk beyond detection long before.
数千万年以来，其中的大部分已经远离尘埃和气体所在的星系盘，因此钙之类的重元素应该早就沉降到检测不出的程度。 yeeyan
But most stars are not massive enough to create the pressures and heat necessary to burn heavy elements, so fusion and heat production stop.
不过大多数恒星都没有足够的质量以产生燃烧重元素所需的压力与热能，所以核聚变与热能产生过程都停止了。 yeeyan
Residing in the stellar halo extending above and below the galaxy's disk, these stars are so old that they formed before earlier generations of stars had much of a chance to produce heavy elements.
这些古老的恒星居于向银河系圆盘上下延伸的恒星晕之中，它们形成的时间很早，早在有机会产生重元素的前几代恒星形成之前。 yeeyan |