um also umm 
(ŭm, əm)
(ŭm, əm)interj.
Used to express doubt or uncertainty or to fill a pause when hesitating in speaking.
| 单词 | um |
| 释义 | um also umm (ŭm, əm)interj. Used to express doubt or uncertainty or to fill a pause when hesitating in speaking. |
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