1.直至；直到；在…之前
If something happensuntil a particular time, it happens during the period before that time and stops at that time.
e.g. until 1982 he was senior lecturer in botany at Durham University.
1982年以前他一直是达勒姆大学生物系的高级讲师。
e.g. ...consumers who have waiteduntil after the Christmas holiday to do that holiday shopping.
等到过完圣诞节才进行节日采购的顾客
2.（与否定词连用）直到…之前，直到…为止，除非
You useuntil with a negative to emphasize the moment in time after which the rest of your statement becomes true, or the condition which would make it true.
e.g. The traffic laws don't take effectuntil the end of the year...
交通法要到年底才生效。
e.g. It was notuntil 1911 that the first of the vitamins was identified.
直到1911年才发现了第一种维生素。
3. upuntil -> see up
Note that you only useuntil ortill when you are talking about time. You do not use these words to talk about place or position. Instead, you should useas far as orup to.Then you'll be riding with us as far as the village?... We walked up to where his bicycle was.1. until的反义词
1. 到：使用这些语言,您 命令程序执行指令序列:把某些数据 放入(put)变量中;从变量中 获取(fetch)数据; 循环(loop)一个指令块 直到(until)满足了某些条件; 如果(if)某个命题为 true,那么就进行某些操作.
2. 结束当前循环：undisplay display命令的反命令,不要显示表达式 |until 结束当前循环 | up 上移栈帧,使另一函数成为当前函数
