而常用 meaning in English

littlest

The backpack shall be filled with heavy stuff at the top , and frequently used items are the last to fit in
背囊内物品的排放层次应以重的在上，而常用的应最后放进
It is hard to degrade all the microcystins by using ordinary waste water treatment process , so it is increasingly urgent to develop a new technology to deal with them
而常用的水处理工艺难以将其彻底去除,开发用于处理微囊藻毒素的新技术越来越迫切。
The traditional objective evaluation method ignores person ' s subjective sensations on the sound , so it is not applicable to the research of sound quality . but the general method of evaluation of sound quality which is carried out with people on - line has the limitation of efficiency , cost , time and so forth , so it is necessary to establish objective evaluation method based on subjective sensations
传统的声音的客观评价由于其没有反映人对声音的主观感受，因此不适用于产品的声质量研究，而常用的由人直接去听测的声质量评价方法由于其效率、滞后性等局限性，因此寻求基于主观感觉的客观评价方法成为必要。