v.放宽,加宽, (使)变宽( widen的第三人称单数 );
例句:
The book widens your vocabulary.
本书使你的字汇量增加.
The Yangtse River widens out here as the land gets flatter.
随着地势变得平坦,长江在这里也变宽了。
The fiver widens as it flows.
河道渐变宽.