That's called constructive interference -- the waves build on each other.

这称为相长干涉。 波相互叠加。

Weather forecasters say over 50 million people in the southern United States will endure high temperatures this week as a heat wave builds up.

天气预报员表示，随着热浪的积聚，本周美国南部将有超过 5000 万人受高温影响。

The bright lines are the result of constructive interference, when light waves build on one another, while the dark spaces in between are the result of destructive interference.

当光波相互叠加时，亮线是相长干涉的结果，而中间的暗线是相消干涉的结果。