laptop [ˈlæptɒp]

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n.笔记本电脑

a portable computer small enough to use in your lap

Laptop is suitable for use on planes. 笔记本电脑适合飞机上使用。
A laptop would be really useful for when I'm working on the train. 我在火车上工作时，便携式电脑真的很有用。