Early booking is advisable.
早订票是明智的。
It will be advisable for you to drop an acquaintance such as John; he is not a good companion for you.
你和约翰那样的人断绝往来是明智的，对于你他并不是一个好伙伴。
It is advisable to book early.
宜提早订票。
It may be advisable to have a blood test to put your mind at rest
最好验一下血，好让你自己放心。
The paths are often very rocky so strong boots are advisable.
路上通常石头很多，所以最好穿结实耐磨的靴子。