| 单词 | u | 
| 释义 | u1 of 5noun   ˈyü     plural u's or us ˈyüz  often capitalized, often attributive 1  a    : the 21st letter of the English alphabet    b    : a graphic representation of this letter    c    : a speech counterpart of orthographic u   2   : a graphic device for reproducing the letter u   3   : one designated u especially as the 21st in order or class   4    [abbreviation for unsatisfactory]    a    : a grade rating a student's work as unsatisfactory    b    : one graded or rated with a U   5   : something shaped like the letter U   u2 of 5 abbreviation (1)1   unit   2   unsymmetrical   3  physics   up (see up entry 4 sense 5)   4   upper   U3 of 5 adjective   ˈyü    : characteristic of the upper classes   U4 of 5 abbreviation (2)1   unsatisfactory   2   uracil   U5 of 5 symbol  uranium   | 
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