However, studies suggest this is extremely hard (hence the rubric routinely attached to British financial products, "Past performance is no guarantee of future returns").

然而，研究表明这是极其困难的(因此“过去的表现并不能保证未来的收益”这种提示通常是英国金融产品的一部分)。

youdao

The balance between the industry and its clients will not be redressed until investors learn that higher fees do not guarantee higher returns.

该行业与客户的关系是不会改变的，除非客户认识到高收费并不保证高回报。

youdao

Of course, as the disclaimer goes, past results are not a guarantee of future returns.

当然，就像免责声明说陈述的，过去的成绩并不保证未来的回报。

youdao

In a paper that will be published soon in the Pacific-Basin Finance Journal, he maintains that not only is past economic growth no guarantee of future stockmarket returns, but even future economic growth (could we but know it) is no guarantee of contemporaneous stockmarket returns except in the most transitory way.

ECONOMIST: Buttonwood

Past returns are no guarantee of future returns, but they can sure make one look good.

FORBES: Nice Returns and Nice Students -- Toledo Students Pitch Intel

As with all investing, however, past outperformance does not guarantee future returns.

FORBES: Magazine Article