Early booking is advisable.

　　早訂票是明智的。

　　It will be advisable for you to drop an acquaintance such as John; he is not a good companion for you.

　　你和約翰那樣的人斷絕往來(lái)是明智的，對(duì)于你他并不是一個(gè)好伙伴。

　　It is advisable to book early.

　　宜提早訂票。

　　It may be advisable to have a blood test to put your mind at rest

　　最好驗(yàn)一下血，好讓你自己放心。

　　The paths are often very rocky so strong boots are advisable.

　　路上通常石頭很多，所以最好穿結(jié)實(shí)耐磨的靴子。