péngyǒu lái wán, guòyè, yòng gōnggòng wèishēngjiān, dōu kěnéng yǐngxiǎng shìyǒu

朋友来玩、过夜、用公共卫生间，都可能影响室友。

Friends coming over, staying the night, or using the shared bathroom can all affect roommates.