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n. 缺点，缺陷；不足之处 | vi. 变节；叛变
vt. 损伤外观，丑化
He composed it for the opening of the John F.Kennedy Center for the Performing Arts in Washington,D.C., in nineteen seventy-one.
VOA : special.2009.08.02
So they began to call this A and this B and this C and this D and this E, this F, this G.
他们开始把这叫做A,B和C,这个是D,E,F,G
聆听音乐课程节选 : 耶鲁公开课
We got to go C, D, some kind of E, F.
而是C,D,某种E,F
Most American colleges and universities use the grading system of A,B,C,D and F.
VOA : special.2009.03.05
In nineteen eighty-four, the John F.Kennedy Center for the Performing Arts in Washington,D.C.
VOA : special.2009.11.29
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