B2 the work needed to keep a road, building, machine, etc. in good condition养护(保持道路、建筑、机器设备等状态良好的工作)
More examples
The network will be down for an hour for routine maintenance.
The new ships, propelled by gas turbines, require less maintenance than older, steam-driven ones.
This course is designed to give drivers a grounding in car maintenance.
There is a risk that the debt-ridden airline that may be tempted to scrimp on maintenance or security.
It's just a regular maintenance shutdown.
UK money that a person must pay regularly by law in order to support their child or previous marriage partner after a divorce (= official end to a marriage)(法律规定离婚后需定期支付用以供养孩子或前配偶的)抚养费,生活费
a situation in which something continues to exist or is not allowed to become less维持;保持
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