在英语中，"It will become warm" 表示 "它将变得温暖"。

这句话的来源是基于英语中 "warm" 的含义，"warm" 指的是 "有热量的、温暖的、舒适的"。

例句：

The sun is shining and it will become warm today. (太阳正在照耀，今天将会变得温暖。)
It's a bit chilly now, but it will become warm when the heater turns on. (现在有点冷，但暖气打开后就会变暖了。)
The weather forecast says it will become warm tomorrow. (天气预报说明明天会变暖。)

希望这些信息能帮到你！