I’m not sure about cycling in such heavy traffic.
在这么拥挤的车辆中骑自行车我不太肯定。
A You should get a bike too. It’s such good exercise.
A 你应该也买辆自行车。骑自行车是非常好的锻炼。
B Maybe I will. But the traffic worries me! I’m not sure about cycling in such heavy traffic.
B 也许我会的。但是交通使我担心！在这么拥挤的车辆中骑自行车我不太肯定。
A Don’t worry about it. Thousands and thousands of people cycle everyday in Beijing.
A 不必担心。北京成千上万的人每天都在骑自行车。
B I suppose you’re right. I should get a bike.
B 我想你是对的。我应该买辆自行车。
A And remember, lots of the roads have special cycle lanes anyway, so you don’t have to worry about cars.
A 还有记住，很多道路有专门的自行车道，所以你不必担心汽车。

Notes注释
1 Remember should / should for a suggestion or recommendation, e.g. You should get a bike / You should get a bike; You should do more exercise / You should do more exercise.
记住should /应该用于提出建议或者推荐某事。例如：You should get a bike /你应该买辆自行车；You should do more exercise /你应该进行更多的锻炼。
2 Notice the various use of the verb worry / worry, e.g. Don’t worry/ Don’t worry; The traffic worries me / The traffic worries me.
注意动词worry /担心的各种用法。例如Don’t worry /不要着急；The traffic worries me /交通使我担心。

Key phrases and sentences
You should get a bike too. 
It’s such good exercise.
Maybe I will. But the traffic
worries me! 
I’m not sure about cycling in such
heavy traffic.
Don’t worry about it. 
Thousands and thousands of
people cycle everyday in Beijing.
I suppose you’re right. 
I should get a bike.
And remember, lots of the roads
have special cycle lanes anyway,
so you don’t have to worry about cars.

你应该也买辆自行车。
骑自行车是非常好的锻炼。
也许我会的。但是交通使我担心！
在这么拥挤的车辆中骑自行车我不太肯定。
不必担心。
北京成千上万的人每天都在骑自行车。
我想你是对的。
我应该买辆自行车。
还有记住，很多道路有专门的自行车道，所以你不必担心汽车。