biān jiǎn tái tóu kàn tā tā mǎ shàng xiào zhe gǎi kǒu bù hǎo yì sī qī tiān

边检抬头看他，他马上笑着改口：“不好意思，七天。

The border officer looked up at him, and he immediately smiled and corrected himself: 'Sorry, seven days.'