1. oral cavity refreshing aqua 
   爽口水
2. the oral cavity; the oral mucous membrane; the oral surface of a starfish. 
   口腔；口腔黏膜；海星的口面。
3. Designating vowels produced at or toward the front of the oral cavity, such as the vowels of green and get. 
   前元音的表示由口腔前部发出的元音，例如green和get的元音
4. The character of a vowel sound determined by the size and shape of the oral cavity and the amount of resonance with which the sound is produced. 
   母音的特性由口腔的大小和形状以及发音时的辅音数目决定的元音的性质
5. A speech sound created by the relatively free passage of breath through the larynx and oral cavity, usually forming the most prominent and central sound of a syllable. 
   元音由通过咽喉和口腔中相对自由的气息发出的声音，常形成音节最突出和中心的音

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