U.抉择与斟酌 - 疑问

不得而知

• it remains to be seen whether

存有疑问

• there is a skepticism about

无疑问

• there is no/little doubt that ...
• it leaves no/little doubt that as to whether

有一点是肯定的

• one thing is certain/apparent that
• one thing is safe to say about ... is

难怪

• no wonder that