一面…，一面…
while doing A, (also) doing B
Structure
一面 动作A ， 一面 动作B
What it means
“While doing A, also doing B”: joins two actions one subject carries on over the same period, or two lines of policy pursued together.
How it is built
(Subject) + 一面 + action A ， 一面 + action B: 他一面读研究生，一面在一家公司实习 (he is doing a master's degree while interning at a company).
When to use it
More formal than 一边…一边…, the everyday choice for two things done at the same moment (一边吃饭一边看手机). 一方面…另一方面… (3-3) sets out two sides of a situation, not two actions.
Watch out
Don't mix the halves of different pairs. ✗ 政府一方面鼓励出口，一面扩大消费 ✓ 政府一面鼓励出口，一面扩大消费.
Examples
船队一面借着季风航行，一面在沿途的港口停泊。
The fleet sailed with the monsoon while putting in at ports along the way.
他一面读研究生，一面在一家公司实习。
He is doing a master’s degree while working as an intern at a company.
政府一面鼓励出口，一面努力扩大国内消费。
The government is encouraging exports while working to expand domestic spending.
Learn this in Lesson 97 · HSK 6–7: 郑和下西洋 (Zheng He’s voyages to the Western Ocean)
A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.
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