In some industries, notably pharmaceuticals, it is doubtful that the huge investments needed to develop new products would be made without the prospect of patent protection.
在某些行业里，特别是医药行业，如果不能指望专利得到保护，是否真有人愿意投入研发所需的大笔资金是个让人质疑的问题。
It was doubtful that the money would ever be found again.
钱是否能失而复得，实在令人怀疑。
With just six weeks left before Chicago, it was very doubtful that he would be able to run a full marathon at a tempo one minute per mile faster than his best, current 5k!
我非常怀疑他能否在6周之后举行的Chicago马拉松上，以比他当时最好5 K每英里快1分钟的配速完成一个全程马拉松！
With just six weeks left before Chicago, it was very doubtful that he would be able to run a full marathon at a tempo one minute per mile faster than his best, current 5k!
我非常怀疑他能否在6周之后举行的Chicago马拉松上，以比他当时最好5 K每英里快1分钟的配速完成一个全程马拉松！
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