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-∞＜χ2＜+∞ 0≤χ2≤+∞ χ2≤1 -∞≤χ2≤0 χ2≥1
colder; it colder; that coldest; the one colder; the one
that ; like one; like that; as one; as
The Beijing Opera The beijing opera Beijing Operas Beijing Opera
mustn’t needn’t daren’t shouldn’t‘
χ12 =χ22 χ12 ＞χ22 χ12 ＜χ22 χ12 比χ22准确 χ22 比χ12准确
-∞<χ2<+∞ -∞<χ2<0 0χ2<+∞ -1<χ2<1 χ2≤1
a worse one such a bad one a nicer one so nice one
The Beijing Opera The beijing opera Beijing Operas Beijing Opera
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