他在页面底部写下了他名字的首字母P.M.R.

He wrote his ___initials, P.M.R., at the bottom of the page.

Paul M. Reynolds拒绝说出首字母'M'代表什么。

Paul M. Reynolds refused to say what the ___initial "M" stood for.

它是黑色的，里面还有我名字的首字母。

It was black and my ___initials were inside it.