persist: v. 坚持, 持续   
infer: v. 推断   
derive: v. 得自，来源于   
industrious: v. 勤勉的，刻苦的   
source: v. 源泉，来源   
convey: v. 传达，转达   
reap: v. 收割，收获   
　　   
We can infer from it that…   
It is very true that … for which there are several reasons.   
Rome was not built in one day.   
To conclude, I would like to borrow another ancient saying that…   
Hence, I firmly believe that…