Research shows that this could be mainly caused by improper use of backpacks.
研究表明,这可能主要是由于使用背包不当造成的。
The hypopotassemia may be mainly caused by in-creased tone in sympathetic-catecholamine system.
低血钾的产生主要由于交感-儿茶酚胺系统紧张性增高所致。
The wheel flange wear is caused by the flange action of the wheel and rail, whereas the double-groove wear on tread may be mainly caused by the break shoe.
轮缘磨耗主要是轮轨相互作用的结果,而踏面上的凹槽磨耗可能主要由闸瓦制动引起。
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