1.date back 追溯
例句:This method, a “ dance ” of healing diseases, can date back to ancient times in china.
此法源远流长，最早可追溯到我国远古时代起利导作用的舞。
2.historic site 遗址
例句:Of course, Beijing is the ideal place for traveling, because there is no shortage of historic site.
当然，北京是一个很理想的旅游观光的地方，因为那里从不缺乏古迹。
3.split up 分裂
例句:Research suggests that children whose parents split up are more likely to drop out of high school.
研究表明，父母离异的孩子更容易从中学中途退学。
4.come back 回来
例句:That is, until you come back.
当然，那得是在你回来之前。
