translation.en: We already have some indicators of productivity on this stuff. OK, if you put steam into coal fields or petroleum fields that have been running for decades, you can get a really substantial increase, like an eight-fold increase, in your output. This is just the beginning stages of this stuff.
translation.zh: 我们在这方面已经有了一些生产力的指标。 如果你将蒸气打入煤矿 或者油田，它们已经被开发了 几十年，你可以获得明显的 增产，比如产量增加8倍。 这还只是最开始的 步骤。