When you hear Western music, you generally get the emotional tone. A major key is happy. A minor one? That's sad.

当你听到西方音乐时，通常你可以感受到它们的情感色彩。大调表示快乐。小调呢？是悲伤。

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Each telephone key has its own tone.

每个电话键都有不同的音调。

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Each telephone key has its own tone.

每个电话键都有不同的音调。

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