Meaning of shùn biàn:
顺便
conveniently; in passing; without much extra effort
Qǐng nǐ shùnbiàn bāng wǒ mǎi yī bēi kāfēi.
请你顺便帮我买一杯咖啡。
Please conveniently help me buy a cup of coffee.
Wǒ qù chāoshì shí, shùnbiàn bāng nǐ mǎile xiē shuǐguǒ.
我去超市时,顺便帮你买了些水果。
I went to the supermarket and bought you some fruit in passing.
Wǒ qù chāoshì de shíhòu, shùnbiàn gěi nǐ mǎi le xiē píngguǒ.
我去超市的时候,顺便给你买了些苹果。
When I went to the supermarket, I picked up some apples for you without much extra effort.