在 + Subject + 的 + 一生 + 中
The noun 一生 (yīshēng) means 'lifetime' or 'one's whole life' and is used to refer to the entire span of a person's existence. It often appears in reflective or narrative contexts when describing what someone did, experienced, or devoted themselves to throughout their life.
她把一生都奉献给了医学研究。
Tā bǎ yīshēng dōu fèngxiàn gěi le yīxué yánjiū.
She devoted her entire life to medical research.
他一生去过很多国家,见识非常广。
Tā yīshēng qù guò hěn duō guójiā, jiànshi fēicháng guǎng.
He has been to many countries in his lifetime and is very well-informed.
这是我一生中最难忘的一天。
Zhè shì wǒ yīshēng zhōng zuì nánwàng de yī tiān.
This is the most unforgettable day of my life.