placidness
/ˈplæs.ɪd.nəs/a state of peacefulness, calmness, or tranquility, often with a lack of excitement or conflict "The placidness of the lake on a sunny day was truly serene."
noun [抽象名词] 平静
The all-pervading and all-purifying atmosphere of water-like placidness makes one forget all cares and worries. 只是一片澄明如水的气氛，净化一切，笼罩一切，使人忘忧。
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- Changes theory ", feathered with inclusiveness, placidness and development, has provided an important reference for solving aforesaid problems." “易学”以它保合太和、含弘光大的个性为解决这一课题提供了重要借鉴。