adj.阴云密布的；阴的；有暗影的
动词cloud的过去式和过去分词.
His face clouded (over) when he heard the news. 他听到这一消息，脸就沉了下来。
Tears clouded her eyes. 眼泪使她的眼晴朦胧不清。
Her eyes clouded with tears. 她泪眼模糊。
The thick mist clouded the mountain-top. 浓雾笼罩着山顶。
