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Grouting machines work uninterruptedly for a very long time.

Grouting machines. The grouting machine is used for construction work that are associated with concrete surfaces.

These are balls of air. “Why does the air rise to the surface of the water?» — you ask.

Perch the straw into the water and blow in that of its tip that is on the surface.

This is the air. You can see the air?

It is also easy to do. This requires rubber pear.

What did you feel? This air affectionately touched your face.

This is because the air is no longer so dense at the height.