noticeably happy and optimistic
开心的,愉快的,乐观的
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how can she be so cheerful at six o'clock in the morning? 她怎么能在清晨六点就那么开心呢?
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a cheerful voice .欢快的声音。
causing happiness by its nature or appearance
令人愉快的,令人振奋的
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cheerful news 令人愉快的消息
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the room was painted in cheerful colours .房间漆成令人振奋的明亮色彩。