Operational maintenance
[计] 运行维护
🧩 词语组成解析
🗣️ 情景例句
It'll all be over in two hours.
再两个小时就结束了。
How long have you been studying English?
你学了多长时间的英语了？
If there is one -- which I take leave to doubt -- then it is older people who create it, not the young themselves.
如果这个问题存在的话 -- 请允许我对此持怀疑态度 -- 那么，这个问题是由老年人而不是青年人造成的。