Until now no

Experts in public health accepted this idea decades ago, but until now no one has been able to show that a woman's ability to read in itself improves her children's chances of survival.

几十年前，公共卫生专家就接受了这一观点。但到目前为止，还没有人能够证明女性的阅读能力本身就能提高孩子的生存几率。

KEEPING mentally agile protects against dementia but until now no one has known exactly why.

保持思维敏捷可防止痴呆症，而迄今为止，没有人知到究竟是何原因。

But until now, no one has applied these findings to the development of tree power.

但直到现在，没有人将该项研究用于树木动力的研发。