For reasons of security the door is always kept locked.

　　為了保證安全，門總是鎖著的。

　　The agreement will open the door to increased international trade.

　　此協(xié)議將會(huì)提供增加國(guó)際貿(mào)易的機(jī)會(huì)。

　　The government's policy is an open door to disaster.

　　政府的政策為災(zāi)難敞開了大門。

　　Doctors still don't understand much about the disease.

　　醫(yī)生對(duì)這種疾病還不太了解。

　　Doctors still don't understand much about the disease.

　　醫(yī)生對(duì)這種疾病還了解不多。

　　The doctor may allow her to return to work next week.

　　醫(yī)生也許會(huì)允許她下周回去上班。