our brains’ shift between being focused and unfocused定位至第8段段末处,our brains switch between being focused and unfocused,其中shift是switch的同义替换,由后半句 they tend to be more efficient得出正确答案为B. can bring about greater effcieny, 是对...
②有些介词如for(为了),from(从……),to(对……),on(在……时)等,可以不译。如: Most substances expand on heating and contract on cooling. 大多数物质热胀冷缩。 ③表示与主语有关的某一方面、范围或内容的介词有时不译,可把介词的宾语译成汉语主语。如: ...
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