The control group was negative result during 20 years.
对照组历年来均为阴性。
The most dramatic increases took place during the past 20 years.
最剧烈的增加发生在过去20年。
Security has been an important factor for the enterprises during the last 20 years.
安全在过去的二十年中一直是企业的重要方面。
During the 20 years Lee put up with her.
在这20年当中，李处处容忍她。
During the past 20 years, a great number of power stations have been set up.
在过去的二十年间，兴建了许多电站。
During the past 20 years, a great number of power stations have been set up.
在过去的二十年间，兴建了许多电站。
应用推荐