Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes.
在水中大多数氢原子和氧原子是稳定的，但这两个元素也有微量以较重的同位素形式存在。
A supernova not only blasts the heavy elements formed in the star out into interstellar space, but also initiates its own nuclear reaction, producing even heavier elements.
超新星不仅把恒星内形成的重元素抛入星际空间，而且它本身也会引发核反应产生更重的元素。
The dredges not only have scoops but also devices for washing sand or gravel and screening it so that gravity settles the heavier and more valuable particles.
采砂船上不仅有挖斗，而且还有冲砂和分选设备，以使较重的有用矿粒因重力而沉积。
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