A lack of vitamin D has long been known to have an effect on bones.

维生素d的缺乏长期认为会影响骨骼。

youdao

The approach to R&D is changing because long-term research was a luxury only a monopoly could afford.

研发的方式正在改变，因为长期研究在过去是只有垄断企业能搞得起的奢侈活动。

youdao

Scientists have long known that vitamin D is a vital nutrient that the skin produces when hit by sunlight. The amount varies, depending on where the person lives, skin pigment, age and other factors.

科学界的共识是,人的皮肤可以通过日晒产生维生素D.而产生的数量并不固定,这取决于人所在地,皮肤的状况,年龄以及其他的因素.

youdao

And the discovery of genetics and D.N.A.molecules took place long after his death.

VOA: special.2009.02.25

And maybe he's taking a little too long, telling you what he'd done over the weekend.

但也许他的故事有点长，他试图告诉你整个周末所做的事情。

It sounds like 课堂 - SpeakingMax英语口语达人

So I'd be forced to stay a long time and not enjoy myself.

我就不得不被迫留下来，却玩得不尽兴。

I'm going实战 - SpeakingMax英语口语达人

Ms. Behar married Steve Janowitz, a retired teacher with whom she'd been in a long-term relationship, in 2011.

WSJ: The Susie and Joy Show

With a 5.6% stake, he'd still be a long way off, unless he's able to use his increasing influence to convince others to change their votes.

FORBES: Magazine Article

But, save for a sort of long face you'd expect when someone's dismissed for a low score, we seldom see any physical manifestation of psychological problems.

BBC: Bitter-sweet sympathy