在他疾病的后期，他需要全天候的护理。

He needed round-the-clock care in the ___later stages of his illness.

年轻时养成的习惯常常在我们的晚年使我们受益。

The habits formed in youth often serve us well in our ___later years.

这项发明的全部影响直到几个世纪后才被人们感受到。

The full impact of the invention would not be felt until ___later centuries.