This piece is in four-four time.

这首乐曲为四分之四拍。

《牛津词典》

I had four children at the time, and the oldest was only four.

现时我有四个孩子，最大的只有四岁。

youdao

I had four children at the time, and the oldest was only four.

现时我有四个孩子，最大的只有四岁。

youdao