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Remove the heart protector or atrium?

Is to let your guard down

Dismantle: To dismantle or dismantle.

Psychological defense: "Psychological defense" is the abbreviation of psychological defense or consciousness defense. Which is psychological defense.

To let your guard down is to be unprepared for people and say nothing.

Atrium: Atrium is the two chambers above the heart. The one on the left is called "left atrium" and the one on the right is called "right atrium", with thick walls and well-developed muscles.