A period of40 days.

• 四十天的时间

A period of40 days.的用法和样例：

例句

1. We can offer you forty days' holiday per annum.
   每年我们将给你四十天的假期。
2. He points out that in 1453 it took 40 days for the pope to learn that Constantinople had fallen to the Turks.
   他指出，一四五三年只是罗马教皇需要花费四十天的时间才能得知土耳其军队攻陷了君士坦丁堡。