It indicates two simultaneous actions.
Wǒ yìbiān kàn shū yìbiān tīng yīnyuè 。
Zài shēngrì pàiduì shàng dàjiā yìbiān tiàowǔ yìbiān chànggē 。
又……又……yòu ……yòu ……
一边……一边……yìbiān ……yìbiān ……
Nǐ zuìhǎo bú yào ___________kāi chē ___________dǎ diànhuà 。
Tā de fángjiān ___________zāng ___________luàn 。
Zhè jiā cāntīng de cài ___________hǎochī ___________biànyi 。
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