观察;看守;注意;监视;
Regular air traffic links London to the rest of the country.
定期班机把伦敦和全国其他地方连接了起来.
length of civil aviation routes: refers to the length of all routes for regular civil aviation flights.
民用航空航线里程:指民航运输定期班机飞行的航线长度的总和。
we took a beijing to hangzhou airliner this morning.
我们今天早上搭乘北京到杭州的定期班机。
Refers to the length of all routes for regular civil aviation flights.
指民航运输定期班机飞行的航线长度的总和.
that's our regular flight to san francisco.
这是我们飞往旧金山的定期班机。
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