名词
中文翻译：平静
同义词：
['tranquil', 'serene', 'calm', 'tranquil']
例句：
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1.The lake is so placid that it almost seems like a mirror.
湖面如此平静，几乎像一面镜子。
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2. The child's placid expression made everyone feel at ease.
孩子平静的表情让每个人都感到放松。
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3. During the peaceful summer evening, she sat by the window, gazing at the placid sky.
在宁静的夏夜，她坐在窗边，凝视着平静的天空。