今天我陪同学看了一下午的笔记本电脑 怎么翻译？

This afternoon I went with my classmate to look for a laptop

楼下的，楼主看电脑不是真看，而是有收集信息买的意思，因此，不能用 look at，看电脑不是有意去看某个电脑，而是泛泛看，因此不用the,而只能用a,请不要误导人家

I accompanied my classmate to look for a notebook PC all the afternoon

I accompanied my classmate choosing laptop all afternoon

i went with my classmate for looking at the laptop the whole afternoon.

I spent my whole afternoon in accompaning my classmate for PC.