... down on 瞧不起；歧视；对…有偏见 down to 降至; 下至; 由大到小; 直到…… down with 打倒, 把...拿下; 打倒；把…拿下 ...
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表面上看，变化规律是，其价值由大到小，甚至消失。
On the surface the law of changing is that its value changes from great to small, even disappears.
试验发现，短纤维束滤料滤层的孔隙率沿过滤方向由大到小，为变孔隙滤层。
Experiments showed decreased porosity of the filter bed along the filtering direction.
结果：丙烯酸树脂牙牙尖磨耗度由大到小分别为：陶瓷、复合树脂、丙烯酸树脂。
Result:The wear of acrylic resin tooth was greatest when against porcelain and then followed with composite resin and acrylic resin.
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