The structure 一面…一面…
"And..., and..."
The structure 一面…一面… 
indicates that two actions are happening at the same time or in the same period of time.
indicates that two actions are happening at the same time or in the same period of time. Pay attention
This structure is used in written language.
If there is a subject in the sentence, it is placed before the structure . In the construction, the ellipses are replaced either by verbs or verb phrases.
Scheme
subject
一面
action 1
一面
action 2
Pay attention
There is often a comma before the second 一面.
Examples
他一面学汉语，一面学日语
He studies Chinese and Japanese
他一面听对方的话，一面签署合同
He is listening to his partner and signing the contract at the same time
tā yímiàn tīng duìfāng de huà, yímiàn qiānshǔ hétóng
你可以一面说话一面吸烟
You can smoke and talk at the same time. Take your time
nǐ kěyǐ yímiàn shuōhuà yímiàn xīyān
一面念书一面工作不是很辛苦吗？
Isn’t it hard to study and work at the same time?
yímiàn niànshū yímiàn gōngzuò bú shì hěn xīnkǔ ma
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