但是的英文：
but
however

参考例句：

But that climb will be gradual.
但是，这个攀升将是平缓的。

But true barbecue is distinctly American.
但是真正的烧烤无疑是美国式的。

But at the same time I couldn’t abjure curiosity
但是同时我又止不住好奇。

But the vengeance of juno was not yet satiated
但是朱诺报复之心不死。

But beethoven could not stay in Vienna
但是，贝多芬不能呆在维也纳。

But that roundabout has stopped.
但是，旋转木马已经停止。

Needs change while policies fossilize.
需要发生改变，但是政策僵化不变。

I wanted to squirm, but I held still.
我想动一动，但是我却一动没动。

But is the annotation approach better?
但是注解方法会更好吗？

A Chinese license will be all right, but I can't read it.
中国驾照也可以，但是我看不懂。

however是什么意思：
conj. 然而，可是，不过
adv. 无论如何，不管怎样；究竟怎样，到底如何

However did you know that?
你到底怎么知道那件事的？

This, however, upset and displeased the peasants.
但这都使农民很不高兴。

However, their intentions are honourable.
然而，他们的初衷是高尚的。

The equations generated, however, are not linear.
但所形成的方程不是线性的。

However, the screens have a limited lifespan.
不过，这种荧屏的使用寿命有限。