Limitations可以从几方面考虑： 资料方面，你所阐述的观点是based on a small sample 因而，你阐述的观点may have limited 同样，所用的资料可能偏重男性或老年人，所以，你的观点may be generalizable only to males or the 方法方面。Future Directions 就写你打算如何处理/解决前面提及的局限性。给你一个例句。The results of the study highlight the need for future research to use a more representative sample
展望zhǎn wàng（往远处看） look into the distance:登上山顶向四周展望 climb to the top of the mountain and get a view of the surrounding country（往将来看） look into the future; look ahead:展望未来 look forward to the future（对发展前途的预测） forecast; prospect:21世纪展望 prospects for the twenty-first century
我觉得吧，写一下你的论文的选材，比如说，你翻阅的材料还是有局限性的，而且题目也是有针对性的，并不是这个result适用于所有方面。还有未来展望应该就是depend on the existing essay， are there any other aspects or area you will focus on to make more depth who or which organization will benefits from your What is the usage of your 我一般就是这么写。。
展望 [词典] expectation; forecast; （往远处看） look into the distance; look into the future;look ahead; [例句]他们只不过是在老调重弹，提出的声明中没有对未来的展望或设想。They are just bringing up all their old rehashed claims with no prospect or vision for the
