a dark cloud of great vertical extent charged with electricity; associated with thunderstorms
例句
用作名词 (n.)
As a thundercloud moves through the air, a strong negative charge gathers near its base. 当雷雨云在空气中移动时，一股很强的负电荷在云层底部附近聚集。
This finding suggests that massive runaway breakdown may have happened within the thundercloud in a process related to the initiation of the triggered lightning. 这个发现说明，雷雨云内可能发生逃逸崩溃的过程，与人造闪电的发生有关。
美
['θʌndərklaʊd]
