半截句子 看不懂出处Natural foods, for example, are vegetables, fruit and grain which have been grown in soil that is rich in organic matter. In simple words, this means that the soil ha...
of which中的which指代use of chemicals and fertilizers，而use of chemicals and fertilizers与purpose是逻辑上的从属关系，所以要说purpose of which, 就象要说purpose of use of chemicals and fertilizers一样，所以就不能用t...
