conj. 在 ... 以前
pref. 在 ... 以前；在..前面
adv. 以前；以往；之前
短语
before class 上课前 ;课前;上课之前; 课前预习
before service 售前服务;售前办事
than before 比以前;前比
not before 不早于;有效起始日期;不得先于; 在此之前
before image 前映象;前镜像;前像;前影像
before landing 着陆前的准备;着陆前的预备
before 惩罚之前
put before 放在前面
shortly before 前不久;在; 以前不久
双语例句：
i have seen him before.
我以前曾经见到过他。
《新英汉大辞典》
they have to vacate their offices before wednesday.
他们必须在星期三以前将办公室腾出来。
dict.kekenet.com
he passed me by as though he had never in his life seen me before.
他不理我，好像在他的生活中他以前从未见过我似的。
《21世纪大英汉词典》
his big book is an expansion of the little book he wrote before.
他那本大部头著作是由他以前写的那本小书扩充而成的。
《新英汉大辞典》
no conclusion should be drawn before all the facts are buttoned down.
所有事实弄清以前，不应该下任何结论。
wap.97lk.com
before going away, he managed his household affairs.
在离开前，他把家务都料理好了。
girls spring up faster than boys before 18.
在18岁以前女孩子比男孩发育得快。
he paused before the door.
他在门前停顿了一下。
dj.iciba.com
a deep hole in the earth gaped before us.
我们面前的地上裂开了一个深坑。
97lk.com
he nicked the tree before he left there.
在离开那里之前，他在树上刻上了痕记。
dict.kekenet.com
before sweeping the house she bound up her hair in a large handkerchief.
打扫房屋前，她把头发用一块大手帕扎起来。
dj.iciba.com
you must check your luggage in before noon.
你必须在中午以前将行李交运。
《21世纪大英汉词典》
she got there before us.
她比我们先到了那里。
《21世纪大英汉词典》
who occupied this house before it was let to us?
这所房屋租给我们以前是谁住的?
《新英汉大辞典》
she wouldn't hold it against you that you have let her down once before.
你以前曾使她失望这件事不会使她对你抱有成见。
《21世纪大英汉词典》
write her before you go.
你去之前先给他写封信。
《21世纪大英汉词典》
he had never been brushed off so rudely before.
他以前从没遭到过如此粗暴的拒绝。
《21世纪大英汉词典》
you must rubber-stamp those letters before you post them.
在邮寄那些封信以前，你必须在上面盖上橡皮图章。
《21世纪大英汉词典》
he hit out at me before i did.
在我想打他之前，他猛击了我一拳。
《21世纪大英汉词典》
we should remember all those who have gone before us.
我们应该记住所有那些先驱者。
《21世纪大英汉词典》
before 英[bɪˈfɔ:(r)] 美[bɪˈfɔr,-ˈfor]
prep. 在…之前; 先于，优于; 当着…的面; 与其…;
conj. 在…之前; 在…以前; 比…早些; 与其…;
adv. 先前，从前; 在前，在前方;
[例句]annie was born a few weeks before christmas
安妮出生在圣诞节前几周。
