Ⅰ名词 (物体上穿通的或凹入较深的部分; 窟窿; 洞穴) hole; cavity 短语和例子 山洞 mountain cave; 在地上挖一个深洞 dig a deep hole in the ground; 点着的香烟在他衣服上烧了一个洞。 a lighted cigarette burned a hole in his clothes.Ⅱ形容词 (深远; 透彻) profound; thorough; clear 短语和例子 洞识虚实 have a thorough understanding of the actual situation (as of the opposing side)