adv. 通常,经常,平常,惯常地;一直,向来;动不动,一般;素;
💡 usual通常的+ly副词后缀→通常地,惯常地
"The discovery of distillation is usually accredited to the Arabs of the 11th century."
通常认为,蒸馏法是阿拉伯人在11世纪发明的。
近义:invariably, mostly, normally, oft, often, oftentimes
反义:infrequently, occasionally, seldom, sometimes