Dachuan and Sun Dawei are walking through the campus when they notice a bike coming at them. Sun Dawei is not able to get out of the way and is knocked over.

Dialogue One

xiǎo xīn kuài ràng  kāi
小  心! 快  让  开!
Take care. Hurry up and keep off!
duì bù qǐ wǒ de chē  zhá  huài le
对  不 起,我  的  车  闸  坏  了。
Sorry. The brake on my bike is broken.
méi guān  xi  qí chē bié qí tài kuài le
没  关  系,骑 车  别  骑 太 快  了!
No problem. Don't ride a bike so quickly!
hǎo  de shí zài  hěn bào  qiàn
好  的, 实 在  很  抱  歉!
Ok. I'm very sorry.
Dialogue Two
nín  zěn me le
您  怎  么 了?
What's wrong with you?
méi shén me  gāng  cái  chōu le liǎng zhī yān
没  什  么, 刚  才  抽  了  两  支  烟,
yǒu  diǎnr ké sou
有  点儿 咳  嗽。
Nothing. I just coughed because I smoked some cigarettes.
nín bié  chōu yān le duì shēn  tǐ  bù hǎo
您  别  抽  烟  了,对  身  体 不  好。
Please don't smoke. It's not good for your health.
xiè xie wǒ  jǐn  liàng shǎo chōu diǎnr
谢  谢, 我  尽  量  少  抽  点儿。
Thanks. I'll smoke as little as possible.

Explanation of difficult points

1. 快让开!
"快让开!" (kuài ràng kāi) means "make way" or "stay out of the way". The "开" (kāi) in "让开" (ràng kāi) has yet another meaning than previously used. In this case, it means "away".

2. 来不及
"来不及" (lái bù jí) means there is not enough time to do something. "来不及" has the same meaning as "没来得及" (méi lái de jí).

3. 别……
"别" (bié) + verb means "don't do something".

4. 了
The "了" (le) at the end of the "别骑太快了"(bié qí tài kuài le) softens the tone to be suggestive rather than demanding.

5. ……对……不好
"……对……不好" (duì bù hǎo) means "(something/doing something) is not good for (something)."