问题标题：
四道初中英语单词变形体1.ThePalaceMuseumhasalarge____(collect).Peoplecanlearnalotinit.2.Whenthefirehappened,thefiremenhurriedthereandcarriedthechildrento___(safe).3.theChinesegovernmenthasmadegreatcontributions
问题描述：
四道初中英语单词变形体
1.ThePalaceMuseumhasalarge____(collect).Peoplecanlearnalotinit.
2.Whenthefirehappened,thefiremenhurriedthereandcarriedthechildrento___(safe).
3.theChinesegovernmenthasmadegreatcontributionstothe___(develop)oftheworld'shighspeedrailway.
4.Lastmonth,Itookmyfirstdirect____(fly)fromShanghaitoTaiwan.
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请解释一下变形的原因.
高卫华回答：
动词变名词
collection
safety
development
flight
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