must have
必須要有；肯定有；应当有
口语·表示必需品或必然性
英文释义
widely believed or accepted to be true; highly probable or certain
例句
A good dictionary is a must have for any language learner.
典故来源
由“must”和“have”组合而成，强调某物不可或缺或必然存在，常用于推荐或推测。