词典释义：
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Color glowed in his face and his strange eyes widened with joyfulness.
他的脸涨得通红，那双奇怪的眼睛瞪得大大的，眼里充满了快乐。
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The joyfulness of a man prolongs his life.
愉快延长一个人的寿命。
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Joyfulness keeps the heart and face young.
愉快让内心及面容保持年轻。
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Your joyfulness may actually become infectious.
你的这种喜悦是会传染的。
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Light music fills my heart with serene joyfulness.
轻音乐能带给我平静的欢乐。
词根 joy
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joyless adj. 不高兴的，不快乐的
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joyously adv. 快乐地
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joy n. 欢乐，快乐；乐趣；高兴 vi. 欣喜，欢喜 vt. 高兴，使快乐
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joyousness n. 高兴；快乐