pull one's leg
开玩笑
(kāiwánxiào)
A: Lisa got accepted by a famous university.
丽莎被一所著名大学录取了。
(lìshā bèi yīsuǒ zhùmínɡ dàxué lùqǔ le. )
B: Don't pull my leg; her studying has always been bad.
别和我开玩笑了,她成绩一直很差的。
(bié hé wǒ kāiwánxiào le, tā chénɡjì yīzhí hěn chà de.)
A: But she got high marks this time.
但是这次她取得了很高的分数。
(dànshì zhècì tā qǔdé le hěn'ɡāo de fēnshù. )
B: Oh wow, that's incredible!
天啊,这太难以置信了。
(tiān a, zhè tài nányǐ zhìxìn le.)