回答

・We are a family of three.
・There're three people in my family.

「我們是一家三口」的英文是 We are a family of three. 或 There're three people in my family.

I have one daughter, so we are a family of three.
（我有一個女兒，我們是一家三口。）

There're three people in my family, so our utility bills are relatively low.
（我們是一家三口，所以水電費相對較便宜。）

以上說明提供給您參考。

有幫助｜0