蜜蜂是花粉的重要传播者。

Bees are important ___transmitters of pollen.

这些小型发射器可以将信号传输到五公里外。

These small ___transmitters can send signals up to five kilometers away.

蝙蝠被认为是埃博拉病毒的传播者。

Bats are known as ___transmitters of the Ebola virus.