如果我们混淆了这三个等级，我们便不会清晰地思考。

If we confuse these three levels, we will not think clearly.

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如果我混淆了这三个等级，我们不会清晰地思考。

If we confuse these three levels we will not think clearly.

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五月20日，惠誉评级将希腊债务评级再度下调三个等级。

On May 20th Fitch, a ratings agency, cut the country’s debt rating by another three notches.

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There are three classes of sugar: monosaccharides, disaccharides, and polysaccharides.

糖分为三个等级,单糖,二糖,以及多糖

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选