一个让我们相信暗物质存在的理由是，如果暗物质不存在的话，星系照现在的速度自转，它们早就分崩离析了，但是对此也无定论。

One reason to believe dark matter exists is that galaxies rotate at such speeds that they would fly apart without it, or so the argument goes.

youdao

骆驼的摇动，沙漠的灼热，以及袋中的化学物质使牛奶离析成凝乳和乳清。

The jouncing of his camel, the desert heat, and the chemicals in the pouch made the milk separate into curds and whey.

youdao

神秘而不可见的物质维系着宇宙免于分崩离析，但它们到底是什么？

What exactly are the mysterious and invisible matters that keep the universe from falling apart?

youdao