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知道你的心脏每分钟大约跳动90多次吗?那就是说,心脏每天都要跳动10万多次。心脏是块不随意肌。这就意味着你用不着非想着它不
Do you know that your heart beat about 90 times a minute? That is, the heart beat more than 100,000 times a day. The heart is a block of involuntary muscles. This means you do not have to think about it