tips:如同编程一样的语法
让步状语，代表前面不太重要，后面重要
even / although / even though/ anyway/ no matter/ whatever/ despite/ Nonetheless / still/ but/ where as/ however/ yet
if statement
if/ because/ purpose of/ in order to/ since otherwise
lead to / cause/ so/ so that / so ...that/ consequently/ hence
&&，||这些
moreover/ in addition/ then/ also/ meanwhile / at the same time/ and/ or/ either...or/ neither...nor
循环条件：
until（注重时间)/ unless(注重条件）