公司中男性与女性的比例是2:1。

The ___ratio of men to women in the company is 2:1.

学校旨在降低其师生比例。

The school aims to lower its pupil-teacher ___ratio.

投资与回报之间的比例对商业成功至关重要。

The ___ratio between investment and return is crucial for business success.