All the main languages have been studied prescriptively, especially in the 18th century approach to the writing of grammars and dictionaries.

所有主要语言都经过了规定性的研究，特别是在18世纪语法和词典的写作方法中。

youdao

The Phosphorus cycle has been studied a lot by ecologists because like I said, Phosphorus is an important nutrient and it's not so abundant.

生态学家对磷循环进行了大量研究，因为如我所说，磷是一种重要而不充足的营养物质。

youdao

This drift has been studied extensively in many animals and in biological activities ranging from the hatching of fruit fly eggs to wheel running by squirrels.

在许多动物中，以及在诸如果蝇卵的孵化乃至松鼠跑动的转轮这样的生物活动中，这种变化趋势一直受到广泛的研究。

youdao

The FBI has studied how "Top Ten" criminals have been caught over the past twenty years.

VOA: special.2010.05.05

This hasn't really been studied but my guess is they become worse and worse for the reason I mentioned before.

原因还没有研究 但我猜测,导致人们的估测越来越遭的原因我提起过

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

He had studied hard obviously and had supposedly been preparing himself for his future career, and that would have been the career of a clergyman.

他显然学的很努力大概也为自己未来的,职业做了些准备，那就是当一名牧师。

耶鲁公开课 - 弥尔顿课程节选

All the facts have been studied and a decision is ripe for the making.

FORBES: Corruption And Election Tricks Are Adding To The U.S.' Energy Troubles

It appears that the subject of male attractiveness in friendships has been studied even less.

CNN: Beholding beauty: How it's been studied

This will be the first time it has been studied in a reasonable number of patients.

BBC: Sleep hormone melatonin in Alzheimer's treatment study