The cardiac contraction is not only fast, but they never tired, is a very strong muscles, so the heart can keep beating until the end of life.
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but they never tired
但他们从不疲倦
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They danced on and on, and days and days went by, and all the country-side came to look at them, but still their feet never tired.
它们跳啊跳，日子也一天天过去，乡下人纷纷赶来看，但它们的脚仍然不知疲倦。
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