Also, large blocks thrown aside by the impact would form secondary craters surrounding the main crater.

此外，撞击留下的大块物质会在主火山口周围形成二级火山口。

youdao

The main secondary manganese oxide is hollandite.

次生锰氧化物主要为锰钡矿。

youdao

The main tasks of the reform are to unify title systems of primary and secondary school teachers and set up senior titles.

改革的主要任务是统一中小学教师职称制度，建立高级职称。

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But Cmdr Hadfield insisted his social media activities were secondary to his main functions at the space station.

BBC: Chris Hadfield: 'Space was too good not to share it'

The ICBL pays lip service to the idea of clearance, but only as secondary to their main bureaucratic, legislative and publicity initiatives.

CENTERFORSECURITYPOLICY: A Political Minefield

Eventually, the Galileo team gave up on the main antenna and reprogrammed the craft to use its smaller secondary dish, which transmits data at a hundredth of the speed of the main one.

ECONOMIST: The long arm of the celestial repairman