This is the 743rd most frequent Chinese word.
一生
"One's whole life; a lifetime."
In this sentence, '一生' emphasizes a lifetime span dedicated to a particular profession or endeavor, illustrating a full life experience.
他从事了医生职业一生。
He dedicated his whole life to the medical profession.
'一生' here conveys the unique and singular nature of the opportunity, suggesting it is so rare it happens only once during a lifetime.
这是一生难得的机会。
This is a once-in-a-lifetime opportunity.
The term '一生' in this sentence refers to the enduring nature of the friendship, lasting throughout one's life.