I need large size.

我需要一件大号的。

Do you want the large size or the small size?

您要大号的还是小号的？您要大号的还是小号的？

You should change from the small to a large size.

你必须把这件小号的衣服换成大号。

Buses, for example, cause problems with their large size.

例如，公共汽车因其体积大而导致问题。

David: I like this style. Do you have it in large size?

我喜欢这个款式，还有大号尺码吗？