题目内容

As for a syllable, nucleus is essential while ________ and coda are optional.

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14种空间格子也叫14种布拉维格子。

The process of coarticulation in which the first sound get influenced by the second is called ______ coarticulation.

注射时螺杆快速前进,而保压时则是维持不动。

广告创意的流程可以大致归纳为“ —— —— ”三个环节。

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