名词
1. In my father's lifetime there have been many changes in the village.
在我父亲的一生中，这个村庄发生了许多变化。
2. She devoted her lifetime to the study of zoology.
她以毕生精力从事动物学研究。
3. He has gone through many a severe test during his lifetime.
他一生中经受过多次严峻的考验。