毫无疑问,人们对于圣诞老人或牙仙的信仰已经消失了。
It has vanished as surely as one's belief in Santa Claus or the tooth fairy.
毫无疑问,全球变暖已经成为我们今天面临的最大问题之一。
There is no doubt that global warming has become one of the biggest problems we face today.
这无疑已经被许多历史学家下了定论。
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