used to indicate the speaker's belief that a statement is certain to be true given what is known about the situation
无疑地,肯定地
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the company would doubtless find the reduced competition to their liking .该公司肯定会觉得竞争的减少很合他们心意。
used to refer to a desirable outcome as though it were certain
必定地,无疑地
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doubtless you'll solve the problem 你必定会解决这个问题。