The only sound to be heard is their somewhat heavy breathing.

唯一能听到的声音是他们有点沉重的呼吸声。

I could hear his heavy breathing.

我听得见他粗重的呼吸。

I could heard his heavy breathing.

我可以听见他沉重的呼吸。

She could hear his heavy breathing.

她能够听到他的猛烈的呼吸声。

She could hear his heavy breathing .

她能够听到他的猛烈的呼吸声。