详细解释
但
1、(形声。从人,旦声。①本义:脱去上衣,露出身体的一部分。经传皆以袒为之。②只,仅,不过)。
2、表示范围,相当于“只”,“仅”。
但闻黄河流水鸣溅溅。---《乐府诗集·木兰诗》
天下所以贵者,但以闻声。---《史记·李斯传》
但已：仅此而已
但凭：任凭;随便
但可：只须。
3、只管,尽管。
此系私室,但坐不妨。---《红楼梦》
4、只是;但是——表示转折。
公干有逸气,但未遒耳。---曹丕《与吴质书》
勤锻炼但不要过分
5、只要——表示假设或条件。
但使龙城飞将在,不教胡马度阴山。---唐·王昌龄《出塞二首》
但出牌呼妾,妾便出来。---《警世通言》
例句
注塑几乎弄不坏，但容易磨损。
Moulded plastic is almost indestructible, but scuffs easily.
楼上亮着灯，但叫门没人回应。
Lights were burning upstairs, but no one answered the door.
这些地区大小各异，但类型相同。
The regions differ in size, but not in kind.
他们试图进入俱乐部，但遭到拒绝。
They tried to get into the club but were refused admission.
他脸上挂着笑容，但眼神依旧严肃。
He was smiling, but his eyes retained a look of solemnity.
变化会有的，但需要很长时间。
Change will come, but it will take time.
我极想发牢骚，但还是没开口。
I was sorely tempted to complain, but I didn't.
口头之言便捷，但缺乏持久性。
The spoken word is immediate but lacks permanence.
食物还可以，但说不上很好。
The food was acceptable, but no more.
我们最后赢了，但比分很近。
We won in the end but it was a near thing.
他说不行，但没有说明原因。
He said no but he didn't give a reason.
她工作虽辛苦，但薪水不低。
Her job is hard work, but the pay is good.
我试过联系他，但电话占线。
I tried to reach him, but the line was engaged.
但这不会威胁到他的奖学金。
But this does not vitiate his scholarship.
囚犯企图逃跑，但失败了。
The prisoners attempted an escape, but failed.
“但为什么？”他插嘴问。
'But why?' he interpolated.
她挫伤严重，但骨骼完好。
She suffered severe bruising, but no bones were broken.
她想要接球，但没有接住。
She tried to catch the ball but bobbled it.
我想买那东西，但钱不够。
I wanted it but I didn't have the money.
他反复尝试，但没有成功。
He tried and tried but without success.
他观察敏锐，但言语寥寥。
He observes keenly, but says little.
我没去过巴西，但很想去。
I haven't been to Brazil, but I'd love to go.
这饮料非常甜，但并不腻。
The drink is very sweet, but not unpleasantly so.
她是个好骑手，但太鲁莽。
She was a good rider, but reckless.
他很聪明，但缺乏积极性。
He's intelligent enough but he lacks motivation.
他的事业稳定但平淡无奇。
He had a steady but unspectacular career.
饭菜不错，但动作太慢。
The food was good but the service was very slow.
我大声呼救，但没人来。
I shouted for help but nobody came.
有豪华型的，但贵得很。
There is a de luxe model available, but it'll cost you.
她父母分居但没离婚。
Her parents are separated but not divorced.