我6岁上小学一年级,爷爷看着我每天背着个大书包,走4里路去上学很心疼,就用自行车送我。我坐在爷爷的身后,感觉比走路舒服多了。爷爷每天很忙很累,为了减轻爷爷的负担,我对爷爷说:“爷爷,您给我买辆小的自行车,让我自己骑着去上学吧。”爷爷给我买了一辆小三轮车,可是那小三轮车速度太慢,步行也比骑车 I am 6 years old in primary school, my grandfather looked at me carrying a large bag every day, go 4 miles to go to school very distressed, I use a bike to send. I sat behind my grandfather, feel more comfortable than walking. Grandpa tired very busy every day, in order to reduce the burden on my grandfather, I said to my grandfather: “Grandpa, you bought me a small bike, let me ride to go to school.” "Grandpa bought me a small Tricycle, but that little tricycle speed is too slow, walking than cycling