陡
dǒu
steep
precipitous; abrubtly; suddenly; unexpectedly
这条山路很陡，走起来不容易。
zhè tiáo shān lù hěn dǒu，zǒu qǐ lái bù róng yì。
This mountain path is very steep, and it is not easy to walk on.
天气陡然变冷，大家都没有准备。
tiān qì dǒu rán biàn lěng，dà jiā dōu méi yǒu zhǔn bèi。
The weather suddenly turned cold, and no one was prepared.