请问Early Warning Signs of retention risks

请问Early Warning Signs of retention risks The man put up a sign warning people not to swim in the river请问这是个什么句式?warning 改为 to warn可以吗,为什么? 英语翻译预警应该是early warning还是alert ____ ____ of sign is it?it's a warning sign.____ _____of sign is it? 请问sign my life must,leave rubbish,this is,a,and,warning sign,we,not连词成句 请问early是什么意思. sign sign sign sign sign 我怎么查不到International Petroleum Price Risk Early-warning Based on Grey Theory ,这篇文章啊 请问英语词中early 请问as early as October 手机开机前显示Quota Usage Warning 请问是什么问题, 同求A New Quantitative Analysis Method for Financial Risk Early Warning of Unlisted Small and Mediu International Petroleum Price Risk Early-warning Based on Grey Theory 谁能帮忙查一下是否sci索引了?