1999年他们开始研制那种新产品。

They started developing the new product in 1999.

youdao

伊朗在二月份开始研制国产无人轰炸机。

Iran started producing its drones back in February.

youdao

很多年前就已经开始研制HIV救生治疗。

Life saving HIV treatment was developed years ago.

youdao

The Hepatitis B subunit vaccine was produced at the same time that HIV-AIDS was being recognized as a problem in this country.

在乙肝亚基疫苗研制出来的同时,在该国家艾滋病开始被视为问题

耶鲁公开课 - 生物医学工程探索课程节选