You are immediately triggering autopilot with those questions.

这些问题立刻自动驾驶模式。

But for the first heartbeats the researchers found no clear pacemakers; different embryos had different cells that started beating first and they triggered the cells around them in a wave-like pattern.

但研究人员现， 初的心跳中并没有明确的起搏器；不同的胚胎中， 始跳动的细胞各不相同， 它们以波浪式的模式周围的细胞。