名词
中文翻译：高兴
同义词：
['contentment', 'happiness', 'joy']
例句：
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1.She was filled with cheerfulness as she saw her friends arrive.
当她看到朋友们到来时，她充满了喜悦。
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2. The children were full of cheerfulness as they played in the park.
孩子们在公园里玩耍时充满了快乐。
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3.He felt a surge of cheerfulness after receiving a well-deserved promotion.
在收到应得的晋升后，他感到了一股由衷的快乐。