approach,与approach to的区别

1.approach做动词时,及物不及物均可.
所以如果是动词用法,则单用approach视为及物动词,直接即宾语均可；
用approach to则把approach视为不及物动词,后面加介宾短语to.
此时两者没有什么区别,后面都加宾语,只能说approach to...更强调一种方向或趋势.
2.approach做名词时,其后常加to...作为后置定语.
如：All the approaches to the village have been blocked.
通往这个山村的所有通道都被堵住了.