一些专家对英国能否达到20%的目标表示怀疑。
Some experts have cast doubt on whether Britain will be able to reach 20%.
一些核专家却怀疑伊朗核试验是否真有实际进展。
Nuclear experts, however, are sceptical about Iran's real progress.
一些专家对这项计划能否解决问题表示怀疑。
Some experts are skeptical that such a program would resolve the problem.
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。
Some experts say they doubt the new defences will offer sufficient protection.
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