克雷默说，以往峰会的经验表明，这些承诺成为现实远非确定无疑的事。
'Our experience with previous summits suggests that it is far from certain' that they will translate into reality, Kraemer said.
过去几年，世间确定无疑的只有三件事：死亡、税收和Facebook不断增长的估值。
For the past several years, there have been three things you could count on: Death, taxes and Facebook gaining in value.
有一件事是确定无疑的，你会反抗那些让你觉得压抑的权威，或者至少也不再附和。
One thing is certain: You will rebel against any kind of authority that you feel is oppressive, or no longer appropriate.
有一天，死亡必然会将我们征服，但有一件事是确定无疑的：我们会昂首挺胸地面对死亡！
Death will conquer us someday, but one thing is absolutely sure: we will die with our heads high!
有一天，死亡必然会将我们征服，但有一件事是确定无疑的：我们会昂首挺胸地面对死亡！
Death will conquer us someday, but one thing is absolutely sure: we will die with our heads high!
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