四级Wireless devices will transmit signals so as to activate the alarm once something wrong is detected.

无线设备将发送信号，以便在检测到错误时激活警报。

六级Now they are trying to figure out what molecular signaling processes activate those seed-building genes in resurrection plants—and how to reproduce them in crops.

现在，他们正试图弄清楚什么样的分子信号传导过程激活了复活植物中的种子构建基因，以及如何在作物中繁殖这些基因。

六级One's brain becomes sharp when it is activated.

一个人的大脑一旦被激活就会变得敏锐。