English Dictionary

radiation

/ˌɹeɪ.di.ˈeɪ.ʃən/

noun

The shooting forth of anything from a point or surface, like diverging rays of light. / The process of radiating waves or particles. / The transfer of energy via radiation. / Radioactive energy.

Exposure to radiation can have harmful effects on the body.

意味（1）

The shooting forth of anything from a point or surface, like diverging rays of light.

heat radiation

意味（2）

The process of radiating waves or particles.

意味（3）

The transfer of energy via radiation.

意味（4）

Radioactive energy.

It's Christmas at ground zero / And if the radiation level's OK / I'll go out with you / To see all the new / Mutations on New Year's Day

意味（5）

(evolutionary theory, countable) A rapid diversification of an ancestral species into many new forms.

So the question is: have plants and animals retained over this huge amount of time—whole radiations of mammals have come and gone in this period—have they retained these potentially costly characteristics?