在于

• 拼音: zài yú
• 汉字拆解: 在 = 土 + 才, to be at/exist in; 于 = classical function word, at/in/on/with

含义

To lie in; to rest with; to depend on. Used to identify the key factor or essence of something.

A formal linking verb used in analytical statements. 关键在于 (the key lies in), 问题在于 (the problem lies in), 重要的在于 (what matters is) are all common structures. 在于 pinpoints the root cause, essential element, or determining factor of a situation.

例句

1. 成功的关键在于坚持不懈，而不是一时的热情和冲劲。
2. 这道菜的美味之处在于食材新鲜以及烹饪时火候的把控。
3. 学习语言的难点不在于词汇量，而在于实际运用的熟练程度。

用法指南

语境: written, academic, analytical

语气: analytical

正确说法

• 问题的关键在于双方缺乏充分的沟通。(The key to the problem lies in both sides lacking sufficient communication.)
• 教育的目的不仅在于传授知识，更在于培养品格。(The purpose of education lies not only in imparting knowledge but also in developing character.)

错误说法

• 将'在于'用于描述物理位置 (Don't use 在于 to describe a physical location — 在 + 于 in this compound means 'lies in' figuratively; use 在 alone or 位于 for actual physical placement)

起源与历史

A compound of 在 (to be at/in) and 于 (classical preposition: at/in/on/with). Together they function as 'to be in/at [something]' — identifying where the essence or cause resides.

文化背景

世代: All ages

社会背景: Universal