extend名词形式是extendibility。extend主要用作动词，意思是：使伸长; 扩大; 扩展; 延长; 使延期; 扩大…的范围(或影响)。extendibility作名词时意思是：可扩展性;可扩充性;扩展性;可延伸性。
一、extend读音
英[ɪkˈstend]
美[ɪkˈstend]
二、extend词性变化
第三人称单数：extends
现在分词：extending
过去式：extended
过去分词：extended
三、extend双语例句
1.They have extended the potential life span of humanity everywhere.
世界各地人类的预期寿命均有所延长。
2.Loans were extended to help pay the interest on the old ones.
这些贷款延期偿还以支付旧账利息。
3.The building was extended in 1500.
那座建筑于1500年扩建。
4.The new territory would extend over one-fifth of Canada's land mass.
这块新领土将会使加拿大陆地面积扩展1/5以上。
5.Our land extends as far as the river.
我们的土地一直延伸到河边。
6.By popular demand, the tour has been extended by two weeks.
应大家要求，这次旅游延长了两周。
