一面⋯⋯ ，一面⋯⋯
解説
表示两个动作或状态同时进行。
Indicates that two actions or states are happening simultaneously.
例文
他一面听老师讲课，一面认真记笔记。
He was listening to the teacher's lecture while taking notes carefully.
他一面做作业，一面看电视，做事一点儿都不用心。
He was watching TV while doing his homework, showing no focus on what he was doing.