The bank has said investors were promised quick, high returns from a bogus financial scheme.

该银行表示，投资者从一个虚假的金融骗局中得到了高回报的快速承诺。

High returns for its shareholders.

为股东创造高额回报。

That often leads to very high returns.

因为这通常会带来很高的回报。

He promised high returns in a short time.

他向投资者许诺短期内的高额收益。

You can worry about high returns and low fees later.

之后你会担心低费用高回报。