用作不及物动词
▲S+～(+A)
Her outlook gradually widens.她的眼光渐渐开阔了。
The river widens as it flows.这条河越流越宽。
用作及物动词
▲S+～+n./pron.
They are widening the road.他们在加宽路面。
◇ 用于be ～ed结构
This road needs to be widened.这条路需要加宽。