But radiation as a general term, actually refers to anything as spread away from it source.

但是辐射在广义上认为指的是任何能够从源头放射的物质。

youdao

If no people clean streets and take the rubbish away, terrible diseases will soon appear and spread easily.

如果没有人打扫街道，把垃圾带走，可怕的疾病很快就会出现并且很容易传播。

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It refers to staying away from crowded places to prevent the spread of COVID-19. Some companies are taking advantages of this by changing their logos.

也就是说，为了防止新冠病毒的扩散，要远离拥挤的地方。一些企业利用这一点，更换了标识。

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By this time, word of Brown's attack had spread to Charles Town, more than twelve kilometers away.

VOA: special.2009.06.25

If pancreatic cancer is not treated, cancer cells can spread into nearby organs or lymph nodes, or, eventually, break away and spread to other parts of the body.

BBC: Obesity 'hikes' pancreatic risk

Certainly something must explain the success of Homo sapiens, and the speed with which the species spread and swept other hominids away.

ECONOMIST: Come up and see my etchings

You can take delivery of one of these right away through 20 dealers as spread out as California, Florida and Minnesota.

FORBES: Easy Rider