4 sentences

1. 他还没能跨过心里那道坎。

   tā hái méi néng kuà​guò xīn lǐ nà dào kǎn.

   He hasn't been able to get over that hurdle in his heart yet.

   Source: Dong Chinese Dictionary

2. 田间的土坎把两块菜地分开了。

   tián jiān de tǔ kǎn bǎ liǎng kuài cài​dì fēn​kāi le.

   An earthen ridge in the field separates the two vegetable plots.

   Source: Dong Chinese Dictionary

3. 路面上有一道深坎，骑自行车时很颠簸。

   lù​miàn shàng yǒu yī dào shēn kǎn, qí zì​xíng​chē shí hěn diān​bǒ.

   There is a deep dip in the road, making it very bumpy to ride a bicycle.

   Source: Dong Chinese Dictionary

4. 我正在学习易经，今天老师详细讲解了坎这一卦的含义。

   wǒ zhèng​zài xué​xí Yì​jīng, jīn​tiān lǎo​shī xiáng​xì jiǎng​jiě le kǎn zhè yī guà de hán​yì.

   I am studying the I Ching, and today the teacher explained the meaning of the Kan hexagram in detail.

   Source: Dong Chinese Dictionary