Why is the spring tide at the new moon and the full moon?

Because tides are two-sided, which is the characteristic of tidal force, and will lengthen the earth's oceans, there are two sides, and the coast experiences high tides twice a day.

Therefore, the two climaxes of the sun and the moon will overlap each other in the new moon and the moon, becoming a spring tide. ?

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Maybe it's more practical to speak with pictures.