shǒujī lǐ de diànzǐ dēngjīpái hěn fāngbiàn dàn jīchǎng lǐ wǎngluò kěnéng màn shǒujī yě kěnéng méi diàn

手机里的电子登机牌很方便，但机场里网络可能慢，手机也可能没电。

The digital boarding pass on your phone is convenient, but the airport network might be slow and your phone might run out of battery.