骑自行车英语怎么说

骑自行车英语可以说是 "riding a bicycle"。"riding" 这个词的语源来自古英语中的 "rídan"，意思是 "在...上面行驶"。例句可以是：
I love riding my bicycle in the park on a sunny day.
Riding a bicycle is a great way to exercise and reduce your carbon footprint.
Make sure to wear a helmet when riding your bicycle for safety.
需要注意的是，在英语中，"bicycle" 是一个不可数名词，所以不能说 "I'm riding a two bicycles"，而应该说 "I'm riding two bicycles"。