It is easy to know a person's outward appearance, but difficult to understand their true character and inner thoughts.
我们共事多年，但我发现我还是不完全了解他，真是画虎画皮难画骨啊。
We've worked together for many years, but I still find myself not fully understanding him; it truly shows that knowing someone's outward appearance is easy, but understanding their true self is difficult.
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