他的文字总是如此枯燥乏味。

His writing is always so ___dry and dull.

如果老师不能使其生动起来，事实和日期就是枯燥且空洞的。

Facts and dates are ___dry and empty if teachers are not able to bring them to life.

教授就一个本该引人入胜的话题进行了一场出奇枯燥的演讲。

The professor delivered a surprisingly ___dry lecture on a topic that should have been fascinating.