This topic has been studied 本课题研究了
have been studied 进行了研究
have not been studied 未得到研究
been studied systematically 系统研究了
have been studied further 进一步研究了
has been studied preliminarily 进行了初步的研究
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
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。
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