留学生点外卖时，可以使用以下表达：

I'd like to order some delivery.

Can I get pizza delivered, please？

I'm staying at XX hotel room XXX. I'd like to order a large pepperoni pizza with extra mushrooms and bacon.

I would like to order some carry-out.

Who is the booking for, please？

May I change...

The order is for here or to go？

I'll eat here.

I'll take it away.

I like your food. Do you deliver？

Hello, I'd like to order some delivery.

这些表达涵盖了点外卖的基本需求，包括菜品选择、送餐地址、时间以及对外卖小哥的尊重。根据具体情境，你可以选择合适的表达来点餐。例如，如果你在酒店房间，可以详细说明你的位置和所点菜品；如果你想要确认送餐方式，可以问“The order is for here or to go？”；如果你想要对外卖小哥表示尊重，可以使用“Thank you for using room service.”。