[MSL]

Double

 Double a: aa.
 Double b: bb.
 Double c: cc.
 Double d: dd.
 Double e: ee.
 Double f: ff.
 Double g: gg.
 Double h: hh.
 Double i: ii.
 Double j: jj.
 Double k: kk.
 Double l: ll.
 Double m: mm.
 Double n: nn.
 Double o: oo.
 Double p: pp.
 Double q: qq.
 Double r: rr.
 Double s: ss.
 Double t: tt.
 Double u: uu.
 Double v: vv.
 Attention! It's 'w' (double-u)^{https://en.oxforddictionaries.com/explore/why-is-w-pronounced-double-u}. Double w (double double-u): ww.
 Double x: xx.
 Double y: yy.
 Double z: zz.

Examples

1) L, e, double t, e, r = letter.
2) B, double o, k = book.
3) L, double e, k = leek.
4) S, p, a, double r, o, w = sparrow.
5) A, double c, e, p, t = accept.

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YY语音: https://dictionary.cambridge.org/pronunciation/english/y