班长的英文是Monitor。
解释：
monitor 英[ˈmɒnɪtə(r)] 美[ˈmɑ:nɪtə(r)]
n. 监测仪; 显示屏，屏幕; [计] 显示器; 监控人员，班长;
vt. 监督; 监控，监听; 搜集，记录; 测定;
vi. 监视;
[例句]他当选为班长。
He was elected monitor.
老师正在跟班长谈话。
The teacher is talking to the monitor.
他是班长，有很多社会工作。
As a monitor, he has many duties outside his study.
班长的发言和几位同学的插话都很有意思。
The monitor's speech and the occasional remarks of some classmates were all veryinteresting.
他将成为他们的好班长。
He will make a good monitor for them.
