The most important thing is the safety of our own. If an error occurred, unable to remove. Therefore, before doing anything. We need to study the details, well, first.
The most important thing is the safety of our own. If an error occurs, we can not come back. So before you do whatever. We need to learn the details so well before.
The most important thing is the safety of ourselves. If crash up we can't get back. So before you do anything whatever. We have to study the details so well before.