与prior to同类型的短语
to描写句子生动的句子？
to描写句子生动的句子？
to是介词，介词后可以跟名词，代词，动名词等。下面看几个to作为介词的句子。
Iam looking forward to seeing my friend.(to 动名词)
He will see to him tomorrow.(to 代词)
we should make a contribution to our country.(to 名词)
另外如果to是不定式符号，那么就要跟动词原形。
we decided to buy a new car.
所以在使用中要注意区分to是介词，还是不定式符号。
approval固定搭配？
approval of，例如：
testing and approval of new drugs will be speeded up.新药品的检测和审批速度将会加快。
alterations had to meet the approval of the local planning authority.任何改建都要取得当地规划机构的批准。
employee can be recruited without the prior approval of the manager.事先未征得经理的同意不可以招收任何员工。