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副词
1. 很可能地;几乎肯定地If you say that something is doubtless the case, you mean that you think it is probably or almost certainly the case.
1. without doubtcertainly
e.g. it's undoubtedly very beautiful
Synonym: undoubtedlydoubtlessly
多通过句子记忆单词,而不是单独死记硬背。