要判定是否喜欢一件东西，唯一的办法是试一试。
“如果以从一到十的惊叹程度来判定一件物品”，目录里写道，“它不容置疑地是十（，我们还曾考虑过认定其为十一）”。
“On an ‘Ooomph’ scale of one to ten,” the catalogue stated, “this is an emphatic, unquestionable, unanimous ten (and we briefly considered 11).
这一条件可以表达为两个非线性系统的对称化渥尔特拉核相等，它构成了判定任意两个非线性系统等效的一种判据。
These conditions can be expressed as the equality of the symmetrized Volterra kernels for two nonlinear systems which are equivalent.
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