6.1 表达已知信息

Ø It has been reported/ observed that/ demonstrated that…

据报道/观察/证明…

Ø …is widely used in…

…被广泛应用于…

Ø Something was found/ reported/ mentioned by somebody.

某人发现/报道/说过某事

Ø …is known to…

…已知…

Ø …has long been successfully applied for…

…已被成功应用于…

6.2 表达未知信息

Ø The animal experimental studies have been carried out for years. However, to our knowledge, only a few cases with clinical application have been reported.

在动物实验研究已经进行了多年。但是，据我们所知，只有少数临床应用的病例报告。

Ø There is insufficient evidence from randomized studies…

来自随机研究的证据不足…

Ø There have been few studies of…

几乎没有关于…的研究

&Oslas