... poor quality 质量差 second-class quality 二等质量 usual quality 一般性能 ...
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second-class quality
二等质量
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。 。
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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。
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