As far as we know, safety comes first (无论什么) you do.
这个周末,威海有一场大型音乐会. .
为了安全起见,请不要到人群密集的地方. .
To save people's lives,the doctors and scientists are risking their lives to do (医学的)research.
Our teachers often encourage us to face the difficulties (勇敢地) and try to overcome them.
When we are in danger, it's very important to make a good (决定).