kěyǐ yòng jiāotōng kǎ ma?
Can I pay with a transport card?
坐二号线。
Take the second line
坐 (zuò) means 'take' (a vehicle), 二 (èr) means 'two', 号 (hào) is a measure word for numbered lines, and 线 (xiàn) means 'line'. So it literally means 'take line number two'.
请坐二号线
qǐng zuò èr hào xiàn
Please take Line 2. — More polite due to the addition of 'please' (请).
上二号线
shàng èr hào xiàn
Get on Line 2. — More casual and shorter, using 上 (shàng) instead of 坐.
请问,怎么去博物馆?
qǐng wèn, zěn me qù bó wù guǎn?
Excuse me, how do I get to the museum?
坐二号线。
zuò èr hào xiàn.
Take Line 2.
Appropriate
Avoid when
You say '坐二号线' (zuò èr hào xiàn).
It is pronounced 'zuò èr hào xiàn'.
Use it when telling someone to take metro Line 2, often in response to a question about directions.
Tomyo
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