Xs或 X's,X級(jí)電影, 成人電影(十八歲以下兒童不得觀看)

The motion (ie for debate) was proposed by Mr X and seconded by Mrs Y. 那動(dòng)議經(jīng)X先生提出有Y夫人附議。

Ms X has been named for the directorship/named as the new director. 某女士已被提名任董事職務(wù)[任命為新董事]。

What does x represent in this equation? 這個(gè)方程式中的x代表什么?