a straight arrow - someone who is very honest and careful to behave in a socially acceptable way.
In most of his films he plays the straight-arrow, all-American guy. (always before noun)
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。