而且，特别地，如果我们令此函数为零，而不是近似为零，它意味着我们在水平集的切平面上移动。
And so, in particular, if we set this equal to zero instead of approximately zero, it means we'll actually be moving on the tangent plane to the level set.
而且，如果我们所知道的所有事情只是一个猜测，或者一个近似的东西；那么事情就可以还有经常会使得我们的想法失效。
Moreover, if everything we know is a guess, an approximation, events can, and often will, invalidate our ideas.
《W.》以近似于漫画的手法描绘了近期的一段历史, 而且也不光只对布什一人.
W.'s semi-comic depiction of recent history will appeal to many.
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