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问个问题 the technique of spectroscopy allows (analyst) of incoming light after it (has been) separated into (its) component wavelengths (by passage) through a prism. allow的用法是allow sb to do sth,这里将analyst改为analysis也不符合这个用法啊?passage这里是名词? cyclamates were introduced in the early 1950's (as) alternative sweeteners (for) use (by) (individuals) who needed (reducing) their sugar intake for medical reasons. need 后面也可以加doing吧? |