It's not possible. If you really want to make it up,fine, but it was not possible then, it is not possible now."

VOA: standard.2009.07.31

And so it's not, perhaps, crippling if this is the conclusion we reach, but at the same time it's not the only possible conclusion.

因此，如果这就是我们的结论，也没有太大关系，但同时要知道这不是惟一可能的结论。

耶鲁公开课 - 文学理论导论课程节选

I know it's possible to induce chemical reactions, but these are exceptions. This is not the norm.

我知道催化化学反应是可能的，但是那些是特例，不是常规情况。

麻省理工公开课 - 固态化学导论课程节选

"There was checking all around. But somehow, it is not possible to check all vehicles, so they might have slipped a vehicle inside and exploded it."

VOA: standard.2009.09.26

But not seeing how it's possible is not the same thing as seeing that it's impossible.

但现阶段无法预见其可能,并不代表永远不可能

耶鲁公开课 - 死亡课程节选