must have been

基本解釋

He must have been so exhausted from impressing her that when she finally gave in, he gave out.
他一定為了給她留下深刻印象而用盡全力，當(dāng)她最終妥協(xié)的時候，他卻筋疲力盡。
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.
如果天賦如達爾文的人都想不出比這更令人信服的答案，那么一定是人類進化中某個關(guān)鍵因素未能找到。
On another photo of two relatives asleep in chairs after Thanksgiving dinner, my Dad left a voice comment in which he joked about how exciting the dinner must have been.
另外一張照片是我的兩個親戚在感恩節(jié)晚餐后坐在椅子上睡著的情形，我爸爸在語音評論里開玩笑稱晚餐時他們一定玩瘋了。

But what I do remember was, at the end of that long, continuous coverage it must have been about two a.m.
He's earned the right to treat himself to this absolutely lovely -what must have been an extraordinary amount of fun to write -lovely catalog of flowers.
他已經(jīng)得到了游蕩的可愛之處,寫這些一定會特別有趣,可愛的花叢中的權(quán)力。
耶魯公開課 - 彌爾頓課程節(jié)選
So, you must imagine these are successive kings who are being buried in this, what must have been, sacred soil.
因此,你必須設(shè)想他們是被埋葬在,這塊圣土中的歷任國王
耶魯公開課 - 古希臘歷史簡介課程節(jié)選

The law or state policy must have been adopted with a neutral or non-religious purpose.
FORBES: North Carolina Lawmakers Introduce Law To Establish An Official State Religion