How to look at the atmospheric motion map, I can't understand which is low pressure and which is high pressure. Please use the attached drawings to explain!

The high pressure is formed by the falling of cold air, the low pressure is formed by the rising of warm air, and the sub-high pressure is formed by the forced falling of warm air in the middle latitude of north and south latitudes. They only affect weather conditions and weather systems.

In weather forecast programs, we can often see a series of numerical forecast charts of atmospheric pressure drawn by meteorologists according to the principle of isobar. In the chart, we can see that in some areas, the isobar is closed, the central air pressure is low, and gradually rises outward. People call it low pressure area, and its spatial isobar is concave, similar to a basin in the terrain. In other areas, the isobar is also closed, but the central air pressure is very high and gradually decreases to the periphery, so that

In the low-pressure area, air flows from all directions to the center, which increases the air density in the center, causing the air to rise continuously, and rainy weather often occurs near the center. In the high-pressure area, the central airflow flows in all directions, and the high-altitude airflow supplements downward to form a downward flow, so the water vapor is not easy to condense, so it is sunny.