that were supposed to prevent anything like it happening again.以期防止這樣的悲劇再次發生
supposed to猜想會; 應該
I'm supposed to be there at five.
我得五點鐘到那兒。
You're supposed to pay the bill by Friday.
你最晚在星期五結清這筆帳。
Vioxx, used to treat rheumatoid arthritis and menstrual pain,萬絡曾用來治療類風濕性關節炎和痛經
used to過去常常
I weigh less than I used to.
我的體重比以前輕了。
Jack used to assist Mary in her lessons.
杰克過去常常幫助瑪麗學習功課。