That can happen but that's abnormal, but changes in maybe the chemistry of the backbone that holds the nucleotides together.

那可能发生的，但属于非正常的变化，但是可能主链的化学变化将核苷酸结合在一起。

youdao

Now the city has five backbone industries: spin costume, engine electric, electrommunication, metal goods, chemistry goods.

中山市当前主要有五大支柱产业：纺织服装、机械电气、电子通讯、金属制品、化学制造。

youdao

Now the city has five backbone industries: spin costume, engine electric, electrommunication, metal goods, chemistry goods.

中山市当前主要有五大支柱产业：纺织服装、机械电气、电子通讯、金属制品、化学制造。

youdao