Thee water is of second-class quality, according to mainland standards.
东江水水质属国家二级水源标准。 。
The second class is not only a useful supplement to the first class but also an effective way to improve the comprehensive quality and ability of students.
第二课堂既是第一课堂的有益补充，也是提高学生综合素质与能力的有效途径。
Our reputation for being easy to do business with and having best in class quality and operational excellence, is second to none.
我们易于合作，我们的产品拥有一流的品质和操控性，这在业界内都是无与伦比的。
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