体内时钟 meaning in Chinese

endogenous clock

Normally the two timers are in step , and the external cues tend to regularise the internal clocks to the more convenient 24 hour period
正常情况下两个定时系统是同步的，外部的信号会将体内时钟调节到更方便的24小时周期。
The other belongs in our internal clocks ( the major one of which may be physically located in a part of the brain called the suprachiasmatic nucleus ) which , left alone , would tie the body to a 25 hour ? yes , 25 ? rhythm
另一个定时系统在我们的体内时钟内（其中一个主要时钟可能位于我们大脑的称为超交叉核的那部分中）这些体内时钟在不受干扰时，会使人体有一个25小时? ?是的， 25小时? ?的生理节奏。
If ， however ， you move the whole body to a time zone which is four hours different ， the two clocks will be out of step ， like two alarm clocks which are normally set together ， but which have been reset a few hours apart . whereas the two clocks would normally sound their alarms together ， now they ring at different times . （ 10 ） similarly ， the body can be set for evening while the sun is rising
此句意思：另一个定时系统在我们的体内时钟内（其中一个主要时钟可能位于我们大脑的称为超交叉核的那部分中）这些体内时钟在不受干扰时，会使人体有一个25小时? ?是的， 25小时? ?的生理节奏。