This is due to the heart getting more efficient at pumping blood around the body, so at rest more blood can be pumped around with each beat, therefore less beats per minute are needed.

这是由于心脏为身体供血的效率提高了，在休息时心脏每搏动一次可以泵送更多血液，所以每分钟需要搏动的次数减少。

youdao

This is due to the heart getting more efficient at pumping blood around the body, so at rest more blood can be pumped around with each beat, therefore less beats per minute are needed.

这是由于心脏为身体供血的效率提高了，在休息时心脏每搏动一次可以泵送更多血液，所以每分钟需要搏动的次数减少。

youdao