话固然不错，但仍须考虑一下

what one says is true, but still requires consideration

我这里参考书固然有，但是对你未必适用。

Admittedly, I do have reference books here, but they will not necessarily be useful to you.

房间固然不大，但还明亮。

Admittedly, the room isn't large, but it is bright.

坐火车固然可以，坐轮船也无不可。

Of course one can go by train, but getting the boat is also possible.