Do you have a smaller size?
你有小一号的吗？
A I like this suitcase.
A 我喜欢这个手提箱。.
B We've got it in black and brown, sir.
B 我们有黑色的和褐色的，先生。
A I like the black one. Have you got it in a smaller size?
A 我喜欢这个黑色的。你有小一号的吗？
B Yes, sir. We've got these suitcases in three sizes - small, medium and large. Here you are.
B 是的，先生。这样的手提箱我们有三个尺寸——小号，中号和大号的。
A That one's a bit too small. I'll take the medium one.
A 那个有点太小。我买这个中号的。
B Certainly, sir. Is there anything else?
B 当然，先生。还要什么吗？

Notes注释
1 Size is often important. Some things come in three sizes: small, medium and large: small / small: medium / medium and: large / large. You can ask: Have you got it in a smaller size? / Have you got it in a smaller size? And decide: That one's a bit too small. / That one's a bit too small. : I'll take the medium one. / I'll take the medium one.
尺寸大小通常很重要。有些东西有三个尺寸：小号，中号和大号：small /小号的 : medium /中号的: 以及large /大号的。你可以问：Have you got it in a smaller size? /你有小一号的吗？并且决定：That one's a bit too small. /那个有点太小。: I'll take the medium one. /我买这个中号的。
2 To describe items like suitcases and even clothes, you can talk about sizes and colours, for example black and brown: black / black/ and brown / brown. We've got it in black and brown. / We've got it in black and brown - and: We've got these suitcases in three sizes / We've got these suitcases in three sizes.
要描述像手提箱甚至衣服这样的物品，你可以谈论号码和颜色，例如黑色和褐色：black /黑色的和brown /褐色的。We've got it in black and brown. /我们有黑色的和褐色的。还有: We've got these suitcases in three sizes /这样的手提箱我们有三个尺寸。

Key phrases and sentences
I like this suitcase.
We've got it in black and brown, sir.
I like the black one.
Have you got it in a smaller size?
Yes, sir. We've got these suitcases in three sizes - small, medium and large. Here you are.
That one's a bit too small.
I'll take the medium one.
Certainly, sir. Is there anything else?重要的短语和句子

我喜欢这个手提箱。.
我们有黑色的和褐色的，先生。
我喜欢这个黑色的。你有小一号的吗？
是的，先生。
这样的手提箱我们有三个尺寸——小号，中号和大号的。
那个有点太小。我买这个中号的。
当然，先生。还要什么吗？