jr是英语单词junior的缩写，意思是初级、小。junior的例句：It was the summer before his junior year in high school（那是他升入高三前的那个夏天）。

junior的例句：He should have been aware of what his junior officers were doing（他本应该清楚自己下级们的所作所为）；I was a naval officer, lieutenant junior grade（我是一名海军中尉军官）。