test ratio的用法和樣例：
例句
- In one corner, ex-KGB tycoons are finding that slumps are a greater test of business ability than booms.
一方是前克格勃大亨們，他們認為在衰退時期比經濟高速增長期更能檢驗出領導人的商業才能。 - The result of the variance ratio showed that the random walk hypothesis on the wheat futures of ZCE was disproved.
方差比檢驗的研究結果卻表明鄭州小麥期貨市場不滿足有效性假設。
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