a small computer that can work with a battery and be easily carried 笔记本电脑；便携式电脑 
I opened my laptop and started typing. 我打开笔记本电脑，开始打字。 - on a laptop
She was still working on her laptop. 她仍在笔记本电脑上工作。
Oxford Collocations DictionaryLaptop is used before these nouns:- battery
- computer
- keyboard
- …
