...这句话的含义,谢谢。Here a flat-plate, fixed solar collector at the best average tilt angle toward the south will often suffice, leaving only small efficiency improvements to be achieved by the fairly costly tracking or concentrating methods.
Not only is smoking bad for your health,it's the source of social problems in developing countries because, since profit from tobacco is very high, tobacco has taken up the best food-growing areas,leading to food shortages.请问 because 在这里有什么作用?
_____ has been stated in theannual white book,our national defense budget per year is well below theaverage of develpoed countries.选项是as ,如果我想用as it has been.......这个句型,不是as引导的非限制定语从句,原句子怎么改?
语法The old man sat in front ofthe television every evening, happy to watch...这里为什么用sat 不是 sitting?是不是有错误?如果无误,那么这是什么用法?做什么成分呢?还有这句话里逗号是个什么意思?是为了防止句子歧义吗?
...r of medical genetics at UC San Diego says, "Most people do not even know their fourth cousins but somehow manage to select as friends the people who resemble our kin.1. 句中select as friends the people who resemble our kin,是将select sb as sth,调换了语序,变为了select as sth sb,...