approval
1.approval后面不可接不定式，如不可说We have obtained his approval to enter his garden，该把to enter改作of our entering。或者把approval改作permission或consent。
2.approval copies available from 1 October to 31 October是“从10月1日到10月31日（该书）样本供人免费审阅，不买可以退货”，注意用approval，不用approved。
