Translation
no previous research 研究, 追究, 探讨, 做研究, 探究
no way of knowing Production 知道, 了解, 认识
not addressed Production 写地址, 演说, 地址
not enough data Production 数据, 资料
not enough is known about Production 知道, 了解, 认识
not well understood Production 了解, 理解, 默认, 听说
not yet resolved 决定, 决心, 决意