He used to be an orphan. A few years ago he had a social worker who had been keeping him on the straight and narrow. He grew up to become a doctor.
keep on the straight and narrow做人保持正軌，也就是保持誠實跟道德，做個好人 = keep on the straight and narrow
The statesman ashed out at the corrupt government official.下一題 - 宣誓就職 f我要發問