You send a letter by air so that your friends may receive it sooner. 你通過(guò)空運的方式寄信,那你的朋友就可以早一點(diǎn)兒收到。
Products with the greatest potential for regular air movement are those having high value or extreme perishability. 高價(jià)值或易腐變質(zhì)產(chǎn)品最有可能成為定期空運的產(chǎn)品。