1, frog in the well, what you see is too small.

2, positive and negative typical, anatomical analysis.

It's really useless to just shout.

4, special type of work, special requirements.

5, the belt of the valve, it is dangerous to trample.

6, to the letter, resolutely implement.

7. Be prepared for danger in times of peace.

8, hands-on prevention, hidden dangers are difficult to hide.

9. Fire should be hollow, and people should be solid.

10, the dike broke the ant hole and air leaked from the needle.