sense 和reason在此方面可以根据英语释义去理解.前者的含义:a normal state of mind,the ability to think clear,在使用的时候常常用复数形式.bring sb to one's senses清醒.
He waited for Dora to come to her senses and return.他等着多拉冷静下来后回家.
而后者的含义:the power of the mind to think in a logical way,使用时为单数形式.例如：
Only human beings are capable of reason.只有人类有理性思考的能力.