The professor said: "It is a real mystery how these creatures are able to live without oxygen because until now we thought only bacteria could do this."

这真是难以理解的事情。 因为此前我们知道仅有细菌可以在无氧状态下存活。

youdao

So, whenever there's any risk of confusion, OK, so not in the cases that we had before because what we've done until now, we didn't really have a problem.

任何情况下，都有可能出现这样的混淆，之前之所以没有出现，是因为直到现在，我们才真正地遇到它。

youdao

Fertility is an issue because women are delaying getting pregnant until their 30s — the average age now for a first-time mother is 30.

生育是一个大问题，因为很多女性直到三十多岁才怀孕，现在的第一次生育的母亲的平均年龄是三十岁。

youdao

"The only opportunity is now." "We can't wait until later because families are going to get separated, people are going to get deported and that's not fair."

VOA: standard.2010.04.12

That is because until now I have not been paying attention to the young man who lives across the street from me.

FORBES: Resilience: What You Can Learn from a High School Quarterback

This could be good news for the companies, because up until now Onglyza has done poorly in the market.

FORBES: Good News For Bristol and Astra -- Maybe

The bankruptcy is a milestone because, until now, China's larger struggling solar companies have been kept afloat by cheap credit and indirect state support.

CNN: Top solar panel maker goes bankrupt