在于
Traditional: 在於
zài yú HSK 5

English Meaning

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📚 Example Sentences

成功在于努力。
Chénggōng zàiyú nǔlì.
Success lies in hard work.
问题在于时间不够。
Wèntí zàiyú shíjiān bú gòu.
The problem is that there isn't enough time.
他的快乐在于帮助别人。
Tā de kuàilè zàiyú bāngzhù biérén.
His happiness is in helping others.
成功在于努力。
Chénggōng zàiyú nǔlì.
Success lies in hard work.
问题在于时间。
Wèntí zàiyú shíjiān.
The problem is in the timing.

💡 Memory Tip

Think of 在于 as 'lies within'—it points to the inner core or reason of something. Break it down: 在 (zài) means 'at' or 'in,' and 于 (yú) is a classical particle indicating location or relation, so together they signify 'to be located in' metaphorically.

📝 Usage Notes

This word is formal and commonly used in written Chinese, such as in essays, reports, or analytical discussions. It is also used in spoken language in formal or serious contexts to emphasize the core reason or essence of a matter.

📖 Grammar Points

在于 is often used in the pattern: Subject + 在于 + Noun/Verb Phrase. It introduces what something fundamentally involves or depends on. For instance, '成功在于努力' (Success lies in hard work). It cannot be used with time or location like 在 (zài) can.

🏯 Cultural Notes

In Chinese philosophy and discourse, 在于 is frequently used to discuss principles, values, or causes, reflecting a cultural emphasis on understanding the root or essence of things. It appears in contexts like traditional sayings or modern analytical writing.

🔄 Similar Words

在于 is similar to 是 (shì, 'to be'), but 在于 specifically emphasizes the inherent or fundamental aspect, while 是 is a general verb for identification. For example, '关键是他' (The key is him) vs. '关键在于他' (The key lies in him), where 在于 adds a nuance of essence or cause.

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