compoundn.化合物；复合词；复合物n.院子(用围墙圈起来的场地）adj.化合的；【语】（词语等）复合的；【植】复合的；【动】群体的vt.混合；调合；使严重；私了；【经】以复利计算vi.妥协compound fold复合褶皱

1. Allophone is a phonetic variant of a phoneme.
   音位变体就是音位的语音变异。
2. The loss of sound can first reter to the disappearance of the very sound as a phoneme in the phonological system.
   语音脱落首先可以指音位系统中作为音位的某个语音的消失。