Definition
这是一个固定成语，出自《论语·为政》中的“三十而立”，指人到了三十岁，通常在事业和心智上开始独立成熟。在现代汉语中，它直接用来表示“三十岁”这个年龄，带有一种人生阶段里程碑的意味，常用于书面或正式场合。
n.
三十岁（多指人生中开始独立自立的阶段）
Examples
- 而立之年，。Tā yǐjīng dào le ér lì zhī nián, shìyè yě jiànjiàn wěndìng le.He has reached the age of thirty, and his career is gradually stabilizing.
- 而立之年。ér lì zhī nián shì yí ge rén cóng qīngnián zǒuxiàng chéngshú de guānjiàn shíqī.The age of thirty is a critical period when a person moves from youth to maturity.
- 而立之年，。Zhèng zhí ér lì zhī nián de tā, duì wèilái chōngmǎn le xìnxīn.At the age of thirty, he is full of confidence in the future.
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