作文如下：
好处：
We can exercise by riding bikes.
我们可以骑自行车锻炼身体。
It is good for our health.
这对我们的健康有好处。
It is a green transportation.
这是一种绿色交通。
It's helpful to protect our environment.
这有助于保护我们的环境。
We can also avoid the traffic jam.
我们还可以避免交通堵塞。
坏处：
We can't reach somewhere that is very far.
我们到不了很远的地方。
It is affected by bad weathers.
它受到恶劣天气的影响。
It is not as convenient as riding a car.
它不如坐汽车方便。
好处1. Riding bikes is helpful to build a healthy body.
2. It's good to enviornment because it does not cause air pollution.
3. It saves time in doing exercises.
4. It trains one's ability of keeping balance.
5. It helps to build muscles.
坏处
It is affected by bad weathers.
It is not as convenient as riding a car.
Too much driving may expose one in the sun for too long.
好处：
We can exercise by riding bikes.
It is good for our health.
It is a green transportation.
It's helpful to protect our environment.
We can also avoid the traffic jam.【traffic jam堵车】
坏处：
We can't reach somewhere that is very far.
It is affected by bad weathers.
It is not as convenient as riding a car.
But it's slower than taking a car or taxi. When it rains, it's inconvenient for riding. And sometimes, the bike may break down suddenly, like the brake cannot work or something.