tā / men / kāi / chē / chuān / guò / zhōu / jiè / hòu / shǒu / jī / xìn / hào / tū / rán / biàn / ruò / le

他们开车穿过州界后，手机信号突然变弱了。

After they drove across the state line, their phone signal suddenly became weaker.