You are immediately triggering autopilot with those questions.

这些问题立刻触发了动驾驶。

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.

但研究人员发现， 最初的心跳中并没有明确的起搏；的胚胎中， 最先开始跳动的细胞各相， 它们以波浪的触发周围的细胞。