New words：

thunder [ˈθʌndər] n. 雷；雷声
thunderstorm [ˈθʌndərˌstɔrm] n. 雷暴；雷雨；雷雨交加

Sample Sentences：

Outside, thunder boomed and crashed.
Turn off the TV set in case of thunderstorm.
The day was heavy and still. It would probably thunder later.

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