Pcr
abbr. 光電導繼電器（Photo-conductive Relay）；程序控制暫存器（program control register）
??? 情景例句
You haven't changed much in fifty years.
你五十年來沒有什么變。
He knocks boldly at the door who brings good news.
彼叩門聲響，必來報佳音。
We had some shoes like those a month ago,but we don't have any now.
一個月前我們有這要的鞋。但是現在沒有了。