"differentiate between" 表示“区分/辨别（两者或多者之间的不同）”，强调通过特征、性质等将两个或多个相似的事物区分开。
其核心结构为 "differentiate between A and B"（用于两者之间）；若涉及三者或以上，更准确的表达是 "differentiate among A, B, and C"（"among" 用于三者及以上）。
1、 接并列对象：
后面必须接两个或多个并列的名词/代词（A、B、C...），因为 "between/among" 表示“在...之间”。
It’s hard to differentiate between identical twins.（很难区分同卵双胞胎。）
The app helps users differentiate among various types of mushrooms.（这款应用帮助用户区分不同种类的蘑菇。）
2、 主语的多样性：
主语可以是人（主动区分），也可以是事物（如测试、特征、标准等，用于辅助区分）。
人作主语：Can you differentiate between a real pearl and a fake one?（你能区分真珍珠和假珍珠吗？）
事物作主语：This test is designed to differentiate between advanced and beginner learners.（这个测试用于区分高级学习者和初级学习者。）
3、 与 "differentiate A from B" 的区别：
两者意思相近（均表示“区分A和B”），但结构不同：
"differentiate between A and B"：强调“在A和B之间做区分”；
"differentiate A from B"：强调“把A从B中区分出来”。
She can differentiate good advice from bad advice.（她能区分好建议和坏建议。）= She can differentiate between good and bad advice.
日常场景：I can’t differentiate between these two brands of tea—they smell the same.（我区分不出这两个品牌的茶——味道一样。）
科学/专业场景：Scientists use genetics to differentiate between different species of fish.（科学家用遗传学区分不同种类的鱼。）
教育场景：Teachers need to differentiate between students who need extra help and those who don’t.（老师需要区分需要额外帮助的学生和不需要的学生。）
道德/认知场景：Children learn to differentiate between right and wrong as they grow up.（孩子长大后会学会区分对错。）
tell the difference between A and B（更口语）：Can you tell the difference between these two paintings?（你能区分这两幅画吗？）
distinguish between A and B（与 "differentiate" 同义，但更常用）：It’s easy to distinguish between a cat and a dog.（区分猫和狗很容易。）
不要误用介词：不能说 "differentiate between A with B"，必须用 "and" 连接并列对象。
三者及以上用 "among"：虽然口语中偶尔用 "between" 接多个对象，但正式语境下三者及以上用 "among" 更准确。
被动语态：可用于被动，但主动更常见（如 The two metals can be differentiated between by their density. → 更自然的表达是 You can differentiate between the two metals by their density.）。
综上，"differentiate between" 是一个正式且精准的区分类短语，常用于需要明确辨别事物差异的场景（如学术、专业、教育等）。掌握其核心结构 "between A and B" 或 "among A, B, C"，就能准确使用。