noun · a metaphorical obstacle, difficult period, or critical juncture in life

他还没能跨过心里那道坎。

noun · a hole, depression, or pit in the ground

路面上有一道深坎，骑自行车时很颠簸。

noun · a low bank, step, or raised edge, such as a ridge between fields

田间的土坎把两块菜地分开了。

proper name, noun · the second of the eight trigrams (Bagua) in the I Ching, symbolizing water

我正在学习易经，今天老师详细讲解了坎这一卦的含义。