英文回答：
Riding a bike can be quite challenging, especially when you have to deal with steep hills or strong headwinds. I remember one time when I was biking to work and I encountered a huge hill that seemed to go on forever. It was really tough to pedal up that hill, and I felt like I was going to run out of breath. Another difficulty I face while biking is when I have to navigate through heavy traffic. It can be really stressful and nerve-wracking to weave in and out of cars while trying to stay safe on the road.
中文回答：
骑自行车确实挺困难的，尤其是要面对陡峭的山坡或者强劲的逆风。我记得有一次我骑车去上班，遇到了一座看似永无止境的大坡。爬那座坡真的很艰难，感觉快没气了。另外一个困难是在繁忙的交通中穿行。在车来车往中穿梭，既要保持安全又要避免碰撞，真的很紧张。
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