用作及物动词
▲S+～+n./pron.
◇ 用于be ～ed结构
The book fair has been prolonged due to some reason.由于某种原因，书展被延长了。
The ceremony will be prolonged by ten minutes.仪式将延长10分钟。
▲S+～+v-ing
Two countries prolonged signing an agreement until details could be agreed on.两国推迟签约直到就细节达成协议。
