形容词
中文翻译：快乐
同义词：
['happy', 'joyful', 'delighted']
例句：
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1. She felt very happy to receive the gift.
她收到礼物时感到非常快乐。
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2. He was so delighted that he couldn't contain his happiness.
他非常开心，以至于无法控制自己的幸福。
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3. The children were all in high spirits, enjoying their time together.
孩子们都精神饱满，享受着在一起的时光。