Their relationship is strictly platonic.

他们的关系完全是纯友谊。

《牛津词典》

Our relationship is strictly Platonic.

我们的关系很纯洁。

youdao

Strictly Platonic escort service pop up every now and then on the Internet and in classified ads, but people inside the industry say they rarely stay in business for more than a few months.

严肃的柏拉图式的陪护不时会出现在网络和分类广告中，但干这一行的人说他们的生意仅能维持数月。

youdao

Agassi: Strictly platonic now, our relationship.

ECONOMIST: Ball babes