The new law was introduced in 1991.

　　這項新法律是于1991年開始實施的。

　　The system was introduced on a trial basis for one month.

　　這個制度已引進試行一個月。

　　There are bound to be changes when the new system is introduced.

　　引進新系統后一定會發生變化。

　　It was announced that new speed restrictions would be introduced.

　　據宣布，將有新的限速規定出臺。

　　The government is ready to introduce protection for the car industry.

　　政府準備對汽車工業實行貿易保護。