Definition: when you are not certain about something, or do not trust someone or something Level: B1
他最近的表现让人对他的领导能力产生了怀疑。
His recent performance has cast ___doubt on his leadership skills.
毫无疑问，定期锻炼能改善健康。
There is no ___doubt that regular exercise improves health.
如果您对这些说明有任何疑问，请尽管提问。
Please ask if you have any ___doubt about the instructions.
