a leopard can't change its spots本性難移美洲豹一身的斑紋是它最顯眼且無法改變的特徵，所以這個習語用來表示一個人固有的特色、個性或習慣無法輕易改變，特別是指不好的事物。如果要用簡單一點的說法，可以說This is who I am.
看看老外聊天時怎麼用a leopard can't change its spots：
Helen: You look tired. Did you stay up late again?
Dylan: Uh…… the book I' ve been reading is so exciting.
Helen: I guess a leopard can't change its spots.
Dylan: Come on. I am going to change Helen: Well, it's your life. Just don't indulge yourself too much.
海倫：你看起來很累，又熬夜了嗎？
迪倫：呃…我在讀的那本書實在太吸引人了。
海倫：我看你實在是本性難移。迪倫：別這樣嘛，我一定會改的。海倫：那是你的生活，總之不要太放縱自己。
a leopard can't change its spots例句精選：
Well, Anne is late for practice again. I guess a leopard can't change its spots.
鮑伯：唉，小安練習又遲到了。我想是江山易改，本性難移吧。
I know I should slow down，but a leopard can't change its spots.
我知道我應該放慢速度，可是江山易改，本性難移。
拓展學習：
stubborn 頑固的；倔強的
entrenched 根深蒂固的
pliable 能變通的
set in one's ways 積習難改
turn over a new leaf 改頭換面
turn into 使變成