[音频]the practice of thinking deeply in silence, esp. for religious reasons or in order to make one's mind calm
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[音频]taking part in sth.; being part of sth. or connected with sth.
[音频]a change in how sth. is done or how people think about sth.
[音频]device that removes sth. from whatever passes through it
[音频](psychology) an erroneous belief that is held in the face of evidence to the contrary; a misken or unfounded opinion or idea