D89 optimal 20190702
1）翻译下面的句子：
一些应用更多关心的是最佳用户体验，而不是不顾一切的增长。
Some applications are more concerned about ensuring optimal user experience than pursuing relentless growth.
（参考翻译：Some apps are more concerned about ensuring optimal user experience than pursuing relentless growth.)
2）结合自己的生活、学习、工作、兴趣等，想象在什么语境下会用到这个表达。先简要描述这个场景，再造句。
This paper addresses the problem of the optimal timing of investment decisions.
