- maintain nitrogen
- 维持: keep; maintain; preserve; ho ...
- 氮: nitrogen
- 维持: keep; maintain; preserve; hold 维持生活 support oneself or one's family; 维持现状 maintain the status quo; let things go on as they are; hold fast to the status quo; 维持原判 affirm the original judgement; 维持治安 keep the peace; maintenance of peace; 维持市场 maintain market; 警察在街上维持秩序。 policemen preserve [maintain] order in the streets.; 维持费 cost of maintenance; 维持关税 preserving duties; 维持价 support level; 维持价格 maintenance price; 维持量 maintenance dose; aequum
- 维持，维持费: maintenance
- 可维持: tenability
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