reasonable这个英语单词是一个形容词，意思是“公平的，合理的”，如：There is reasonable concordance between the two sets of results.
这个单词是由名词reason变化过来的，名词reason的意思是“理由”。它的副词则是reasonably， 意思也是“合理地”。
是reasonably，reason
From now on events moved reasonably quickly.
从此，事情发展得相当快。
The meeting ended on reasonably amicable terms.
这次会议在相当友好的氛围中结束。
The soil is reasonably moist after the September rain.
9月的雨水之后，土壤适度湿润。
I can be reasonably precise about the time of the incident.
我可以相当准确地说出这件事发生的时间。
He couldn't reasonably be expected to pay back the loan all at once.
公平合理地讲，不可能指望他一下子归还全部借款。I know the reason why he was late.
我知道他迟到的原因。
