孩子们敬畏地看着巨大的飞艇缓缓升入天空。

The children watched in awe as the huge ___aerostat slowly rose into the sky.

警方使用系留气球搭载通讯设备，以增强大型活动的安保能力。

The police use ___aerostats with communication equipment to enhance security at large events.