关于这个问题不可臆测。

No conjecture can be offered on the subject.

谁策划了爆炸的问题仍属于臆测。

The question of who planted the bomb remains a matter of guesswork.

这是尽我所能对我的目标所进行的臆测。

That surmises my goal as best as I can imagine.

韦克厄姆先生把这些报道当作臆测而不予理会。

Mr. Wakeham dismissed the reports as speculation.

时序保护还只是个臆测而已，所以时光旅行仍是可能的。

Chronology protection is still just a conjecture, so time travel remains a possibility.