[English] [ri:kt? v ksidn？ spi:？ I:z][ America ][rikt? v？ ks？ dn？ spi？ iz]

Reactive oxygen species;

Example:

1.

Hekimi hopes that further experiments can accurately determine how reactive oxygen species can prolong the life of worms.

Heikemi hopes that further experiments can determine how reactive oxygen free radicals can prolong the life cycle of worms.

2.

No one knows exactly how all this works, but it seems that plasma produces so-called reactive oxygen species in the air.

No one fully knows how this fact works, but it seems to be the function of so-called active oxygen produced by plasma in the air.