The townspeople try to communicate with the Martians with a white flag, but are attacked by a heat ray.

镇上的居民试图用白旗与火星人交流，但遭到了热射线的攻击。

It was used in this piece of apparatus to shine in an infrared laser that’s like a heat ray at one frequency and it came out as twice the frequency.

它被用在这台设备中，以一种频率像热射线一样的红外激光照射，它以两倍的频率发出。