through-flight

例句：

1. 1. The airlineshave been conducting through-flights to reduce carbon emissions.
   航空公司一直在进行过境飞行以减少碳排放。
2. 2. During theoverflight, the pilot had tomake several emergency landings.
   在过境飞行期间，飞行员不得不多次紧急降落。
3. 3.The government has announced plans to increase thenumber of through-flights betweenmajor cities.
   政府宣布计划增加主要城市之间的过境航班数量。