If a man of Darwin's genius could not have come up a more convincing solution than that, some key factor must have been missing from the narrative.

如果天赋如达尔文的人都想不出比这更令人信服的答案，那么一定是人类进化中某个关键因素未能找到。

youdao

At first everybody had thought that the house must have been robbed, but nothing was missing.

起初大家以为房子一定是被抢了，但什么也没丢。

youdao

As no pumas had been reported missing from any zoo in the country , this one must have been in the possession of a private collector and somehow managed to eacape .

由于全国动物园没有一家报告丢了美洲狮，因此那只美洲狮一定是某位私人收藏豢养的，不知怎么设法逃出来了。

youdao

After all, there must have been days when Gadbois miscounted, or started counting his steps too soon, or too late missing his wife by mere millimetres.

NEWYORKER: Sweetheart Sorrow