Scientists no longer think it's about heart beats,科学家不再认为心跳速率是其中关键

no longer:不再

He is no longer within the pale of noble society.

他不再是贵族社会的一员了。

He weeded out the books he no longer needed.

他把不再需要的书清理出去了。

we use oxygen to essentially generate energy so that we can live.我们需要氧气产生能量维持生命

so that:因此； 以至于； 以便

Bring it closer so that I may see it better.

把它拿近点儿，让我看看仔细。

Let down a rope so that I can climb up.

放下绳子，让我爬上去。

词汇拓展:

so far as that goes就现状来说(就其本身而言)

So far as that is concerned, you must have understood my determination.

谈到这里,你一定已经明白我的决心。