Some experts doubt that Ares I will make the cut, given that it was largely designed to serve as a space shuttle replacement to ferry humans to the International Space Station.
一些专家学者怀疑，战神1号项目可能不会继续，因为战神系列火箭的设计初衷就是作为航天飞机的替代品承担向国际空间站运送飞行员的任务。
The doubt expressed by some bone doctors and nutrition experts doesn't surprise Dr. John A. Baron, a co-author of the study and professor of medicine at Dartmouth Medical School.
约翰·阿·巴伦医生对那些骨科医生和营养专家的怀疑态度并不感到惊讶。 他是这项研究的合作者之一，现为达特茅斯医学院的主任医师。
Some experts have cast doubt on whether Britain will be able to reach 20%.
一些专家对英国能否达到20%的目标表示怀疑。
Some experts say they doubt the new defences will offer sufficient protection.
一些专家表示，他们怀疑新的防御工事能否提供充分的保护作用。
Some experts say they doubt the new defences will offer sufficient protection.
一些专家表示，他们怀疑新的防御工事能否提供充分的保护作用。
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