4周搞定2000+托福核心词
once
常考释义
Of course in peak times like the summer holidays we do them every weekend, but at the moment it's usually once a month at most.
Of course in peak times like the summer holidays we do them every weekend, but at the moment it's usually once a month at most.
来源于：剑雅5-Test1adv. once again;once more：又一次；再次
Once again British justice has appeared to falter.
英国司法制度似乎再次显现出颓势。
She wanted to see him once more before she died.
她想在临死之前再见上他一面。
adv. once and for all：彻底地；一劳永逸地
They had to be defeated once and for all.
必须彻底击败他们。
adv. once in a while：偶尔；间或
Every once in a while we go to the cinema.
我们偶尔会去看电影。
adv. once or twice：一两次；几次
She had been to London once or twice before.
她以前去过伦敦一两次。
adv. once removed：关系相隔一代的
a cousin once removed
隔一代的堂亲（或表亲）
adv. once upon a time：从前；很久以前；（用于谈论已不存在的状况，尤指过去的状况比现在的好）想当年
Once upon a time there were three princes.
很久很久以前，有三位王子。
Once upon a time, I wanted to change the world.
想当年，我曾想改变这个世界。
adv. 一次；一回
I met her once, briefly.
我曾经和她有过短短的一面之缘。
I've been to France once before.
我以前曾经去过一次法国。
Once a week
每周一次
Once a month
每月一次
Once every fortnight
每两周一次
Once every three months
每三个月一次
adv. 以前；曾经；一度
Texas was once ruled by Mexico.
得克萨斯州曾经归墨西哥管辖。
I knew him once.
我以前认识他。
My memory isn't as good as it once was.
我的记忆力不如以前好了。
adv. （用于条件从句）一旦，真的<文>
if you once forget it
你一旦忘记它的话
conj. 一旦…（就…）；一…（就…）
Once inside her flat, she opened the letter.
一回到自己的公寓，她就拆开了那封信。
Once you have kids, your priorities change.
一旦有了孩子，你的生活重心就会发生变化。
n. all at once：突然；忽然；同时；一起
All at once there was someone knocking on the door.
忽然有人敲门。
n. at once：立即；马上；同时；既…（又…）
I knew at once that something was wrong.
我立刻意识到情况不妙。
They all arrived at once.
他们都是同时到达的。
Everybody is talking at once.
所有人都同时在说话。
It was at once a question and a command.
这既是询问，也是命令。
n. for once：仅此一次；破例一次
She was able, for once, to relax.
只有这一次，她能够放松一下。
n. just the once：只有一次
Can I borrow your car?—All right then, just this once.
我能借一下你的车吗？——那好吧，仅此一次。
adv. 成一倍地【数】
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