Which is right, the thump or the thump?

Knock-knock and knock-knock are both correct, and the differences are as follows:

1, for different reasons: thumping usually happens when you feel excited, anxious or nervous. Its rhythm is faster and its beating is obvious. Some people can even hear their own heartbeat. Heavy blow is due to some abnormalities of the body, such as heart disease, fatigue, anemia and so on. , leading to irregular heartbeat, or even jumping at too long or too short an interval.

2, the impact is different: although beating will bring us trouble in some extreme cases, such as affecting sleep or mood, it generally does not have much impact on physical health. In contrast, heavy blow is a very serious precursor of heart disease. If it is not checked and treated in time, it may lead to serious physical injury and even death.