Add the bat alert signal and pray the bats fly into their trap.

那就是安置蝙蝠报警信号和祈祷蝙蝠的到来。

A vaccine works by delivering an " infection" signal (something from the germ) and an " alert" signal (to wake the immune response up).

疫苗的工作原理是传递一个“感染”信号（来自细菌）和一个“警报”信号（唤醒免疫反应）。