add up to 托福

Whole book divides 6 order, include " adscript " add up to 186 page, 13...

全书分6章，包括《后记》共计186页，13．.

However, many a mickle makes a muckle, and in total they add up to something significant.

但是，积少成多，这些习惯积累起来就成了巨大的风险。