2007.10.23 : He is at his best when he speaks off the cuff.
他即兴讲话讲得很出色。
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off the cuff: without preparing ahead of time what one will say; extemporaneous. 无准备地，即兴地，即席的，不用讲稿的
再如:
Considering that the speech was off the cuff，it was rather good.
由于这发言是毫无准备的，所以它还算是不错的。
海纳百川，有容乃大；壁立千仞，无欲则刚。