1、Further experimental investigat are needed toestimate…

2、What is now needed is cross-national-studyinvolving…

3、These findings provide the following insights forfuture research:…

4、Considerably more work will need to be done to determine.

5、Future trials should assess a full selective decontamination regimer tncluding…

6、More research is needed to better understand when implementation ends and…

还有这么多。注意！勿照搬