We cannot guess his motives.

我们不能猜测他的动机。

youdao

You cannot guess; you cannot forget.

你不能猜测，不能遗忘。

youdao

So mother can guess the birth date but cannot guess the death date of their children.

母亲能知道自己孩子的来临之时，却不可能知道他们的告归之日。

youdao

We cannot guess his motives. We just have to deal with the reality: that a North Korea that is proliferating weapons and missiles is a serious threat and danger to the world."

VOA: standard.2009.06.14

Similarly, with little nuclear expertise, most of us cannot guess at how the current situation will be resolved.

FORBES: Pause in a Bull Market?

We must learn to be comfortable in the midst of diversity, to find at least a small part of ourselves in every person we meet and to treat one another as an entirely unique and irreplaceable human being whose talents, opinions, background, education and skill we cannot guess at but must learn anew every time we stick out our hand to introduce ourselves to another.

FORBES: Turning Gender-War-Swords into Ploughshares

Not having first-hand knowledge of the facts, I cannot fairly hazard a guess as to why the respondents in this arbitration paid any settlement to this pubic customer or why the individual stockbroker named in the case simply took the blows and opted for nothing more than expungement.

FORBES: Customer Settled Suitability and Churning Case But Stockbroker Wins Expungement