overcast a. 阴天的,阴暗的,愁闷的；
overcrowded a. 过度拥挤的；
overcrowding a. 人口过密的；
overdue a. 过期的,未兑的,迟到的；
overewhelming adj.压倒一切的；
overjoyed adj. 非常高兴；
overlapping adj. 相互重叠的
例句：
The weather forecast is for showers and overcast skies.
气象预报说有阵雨而且阴天。
The overcast sky is stifling.
阴暗的天空令人感到沉闷。
Too many poor people are living in overcrowded conditions.
有太多的贫民生活在十分拥挤的条件下。
Thousands of refugees are packed into overcrowded towns and villages.
成千上万的难民挤入拥挤不堪的城镇与村庄。
温馨提示：
