Entire fortunes were lost, and the event stands a reminder today about the risk of speculative investments.

所有的财产都损失了，今天的事件提醒人们投机性投资的风险。

Many investors are buying NFTs as a speculative investment, hoping to flip them at a much higher price than they originally paid.

许多投资者购买 NFT 作为投机性投资，希望以比最初支付的价格高得多的价格出售它们。

However, much of this economic expansion was based on speculative investment which created a huge economic bubble, one which burst spectacularly in the autumn of 1929 with the Wall Street Crash.

然而，这种经济扩张很大程度上是建立在投机投资的基础上的， 投机投资创造了巨大的经济泡沫，并于 1929 年秋天随着华尔街崩盘而轰然破裂。

I think I'd heard about him in history class, but I was reading into some of his, you know, business ventures back in the day, and he made a killing doing, like, speculative investments in railroad stock back when that was hot.

我想我在历史课上听说过他，但我正在读他的一些，你知道的，当时的商业冒险，他在铁路股票的投机性投资中赚了大钱， 当时很火热。