开心

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The Chinese word 开心 (kāixīn) is a compound word consisting of two characters: 开 (kāi) and 心 (xīn). The character 开 (kāi) originally meant "to open" or "to begin", and it is often used in the sense of "to be happy" or "to be cheerful". The character 心 (xīn) means "heart" or "mind", and it is often used in the sense of "feeling" or "emotion". When these two characters are combined, they form the word 开心 (kāixīn), which literally means "to open the heart" or "to feel happy". This word is commonly used in Chinese to express the feeling of happiness, joy, or contentment.