WELCOME TO THE UNIT
01. tell sb. sth. =tell sth. to sb. 告知某人某事
tell sb. to do sth. 让某人做某事
tell the difference between A and B=tell A from B 区分A和B
02. run into/across, come across （偶然）碰见 遇见
run after 追 追求；run out of … 用完 耗尽 …
03. the reason for … …的原因；for …reason(s) 由于…的原因
