Problems must first of all be recognized.这里first of all为什么是插入语?放在句首或句尾不也可以吗?

翻译英语Problems must first of all be recognized. Problems must first of all be recognized.这里first of all为什么是插入语?放在句首或句尾不也可以吗? work must come first 翻译Work must come first people must think about the problems before before moving. We must learn how to chang these problems into challenges. problems My wife must see it first中的first是什么意思 he must __(finish)his homework first. 英语翻译In short,safety must come first Work must come first的汉语翻译 must,first,come,work 连词成句 Remember,work must come first中文? she_____{must}do her homework first after she must look up and down first You must first be finished before lunch. you must first可以这么说么 to konw happiness,you must first experience