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.
In 2016, a blizzard hit the Northeast U. S. it dropped record amounts of snow in many areas, including New York City and Washington, D. c.
2016年，一场暴风雪袭击了美国东北部，包括纽约市和华盛顿特区在内的很多地区都创下了降雪量记录。
Expect it to hit some time before the end of 2011. (All Things d).
预计它将于2011年末的某个时候正式面世。
Another round of stereoscopic 3-d films that had viewers wearing red-and-green glasses hit screens in the 1970s.
另外一轮立体三维电影，他们需要观众佩戴红绿眼镜观看在70年代上映。
‘It’s a Plan D, ’ he said. ‘It’s essentially an insurance policy for the situation where we hit a tipping point in climate change quickly.’
他说：“这是一个D计划（后备方案），它实质上是在气候变化太快时所采用的一种解决方案。”
When the economy hit its recent downturn, she was laid off from her job as the Director of Business development for an architectural firm in Washington D. C.
在最近一波经济衰退中，布里吉失去了她在首都华盛顿一家建筑公司的业务总监职位。
At first, it didn't hit him. He wasn't sure if he had heard right. Jeon P. d.
开始他并未搞明白是怎么一回事，他怀疑是不是自己听错了。
'it's a Plan d,' he said. 'it's essentially an insurance policy for the situation where we hit a tipping point in climate change quickly.'
他说：“这是一个D计划(后备方案)，它实质上是在气候变化太快时所采用的一种解决方案。”
By 2-D condensed index, hit the target rate of star identification is improved.
对星三角形进行二维精简索引，以提高检索效率、节约比对时间；
By 2-D condensed index, hit the target rate of star identification is improved.
对星三角形进行二维精简索引，以提高检索效率、节约比对时间；
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