though和but只用其一的原因,要求关于语法的,不要简单的结论,就是想知道“为什么”

though和but只用其一的原因,要求关于语法的,不要简单的结论,就是想知道“为什么”

though [美] [ðo] [英] [ðəu]
连词
虽然;尽管
Though he is rich,his life is not happy.他虽然很有钱,但生活并不幸福.
副词
(一般放在句尾)然而,还是
It was a hard job,he took it though.这是份苦差事,可他还是接受了.
相关词组
even though
即使;虽然
even if/though
即使;虽然
as though
犹如;好像
Web 翻译
though
虽然
result),“鉴于此原因”(for this reason),“虽然”(though),“如此”(thus)和“于.是”( therefore).在不同的段落间需加入过渡语句.除非在前文中清楚提过,请勿使 ...
www.myoops.org
可是
though conj.虽然,可是.thought n.思考,思想；念头.thousand num.千.thread n .线.three num.三.throat n.喉咙.through prep.穿（通）过；从始至终ad....
202.192.128.41
尽管
but但是instead(0f)代替despite不管though尽管conversely相反地unlike不象whereas然而 as well也,此外besides在…旁边；除了such如此this means这意味着still then就在 ...
en.eol.cn
然而
类型；样式 a type of 一种类型的… line n.线；生产线；排,行 human n.人；adj.人 的,人类的 though conj.但是,然而；虽然 agree vt.& vi.同意,赞成 ...
www.for68.com
即使
though虽然；即使；纵然 necessary必要的；必须的；必需的 beat打败；战胜；超过 care 对……在意；对……计硬 friendship友好；友谊 primary初级的；小学的 ...
but [美] [bʌt] [英] [bʌt]
连词
但是
It is hot in summer here,but it is not cold in winter.这里夏天热,但冬天不冷.
(通常用 not ...but ...)而是
Our purpose is not to do it for you but to teach you to do it by yourself.我们的目的不是替你做这事,而是教会你自己来做.
可是,然而
She looks very young,but she is already in her 30's.她看上去很年轻,可是她已三十多岁了.
(表示惊讶、不同意等)喔,哇
Heavens,but it snows.天哪,真的下雪了.
(用来加强语句重复部分的语气)一定
We will be here on time.But on time.我们将准时到达这里,一定准时.
(用来引入新话题)那就
But now to the last question.现在就来谈最后一个问题吧.
(常用于否定句)而不;若不
But that I saw it,I wouldn't have believed it.若不是亲眼目睹,我还不会相信呢.
It's not so high but we can jump it.它并非高到我们跳不过去的地步.
(用于含 doubt ,question 等字的否定句中,相当于 that )对于
There is no doubt but he won.对于他获胜这一点没有疑问.
副词
只,仅仅,才
It took her but a few days to learn it.只不过几天时间她就学会了.
【美】【俚】(用来加强语气)肯定地,绝对地
Go there but fast!赶快到那儿去!
介词
(用于 nothing ,nobody ,who ,all 等词后面)除...以外
No one saw it but me.除了我没有人看到.
Dick seldom talks of anything but music.迪克很少谈及音乐以外的事情.
代词
(关系代词,相当于 who ...not ,which ...not )没有...不
Not a man but felt it.没有人不感觉到它.
名词 ( pl.buts )
用"但是"来表示反对;异议
Not so many buts,please.请别老是反对个没完.
相关词组
cannot but
不得不 ,不能不
Near is my shirt but nearer is my skin.
首先考虑自己
nothing but
只有
have no alternative but
除...外别无选择
Heaven's vengeance is slow but sure.
天网恢恢,疏而不漏.
anything but
单单除...之外 ,根本不
but for
要不是
not but that
虽然
cannot choose but
只得
it never rains but it pours
(谚)不雨则已,一雨倾盆;灾祸等不发生则已,一发生便接踵而至
Web 翻译
but
但是
but但是instead(0f)代替despite不管though尽管conversely相反地unlike不象whereas然而 as well也,此外besides在…旁边；除了such如此this means这意味着still then就在 ...
en.eol.cn
可是
原来我们生产的香烟叫“蜣螂虫牌”,蜣螂虫虽然这个牌子不够响亮,可是（but）它乡土 气息很浓啊!后来我们一翻字典才知道,敢情蜣螂虫是屎壳郎啊 推粪球儿的!...
english.cri.cn
转折
转折(but)类A,比较/对比(contrasting) Conversely in comparison in contrast to this Instead nevertheless on the contrary On the other hand … whereas… … while/ ...
www.sooxue.com
BUT
泪膜破裂时间
方法:对接受LASIK手术的205 例398 只眼手术前后行荧光素钠染色、泪膜破裂时间(BUT)、
角膜地形图进行观察....
scholar.ilib.cn
But
然而
然而while ,whereas,but,however,nevertheless.尽管如此in spite of that,despite all this.但在另一方面but on the other hand ...