他们讨论的是怎样减少世界上的武器。

Tāmen tǎolùn de shì zěnyàng jiǎnshǎo shìjiè shàng de wǔqì.

What they are discussing is how to reduce the weapons in the world.

科学技术进步以后，武器也变得更强大了。

Kēxué jìshù jìnbù yǐhòu, wǔqì yě biànde gèng qiángdà le.

After science and technology advanced, weapons also became more powerful.

在这部电影里，外星人带来了高科技武器。

Zài zhè bù diànyǐng lǐ, wàixīngrén dàilái le gāokējì wǔqì.

In this movie, the aliens bring high‑tech weapons.