（）s are sounds produced without obstruction, so no turbulence or a total stopping of the air can be perceived.-未来题库

（）s are sounds produced without obstruction, so no turbulence or a total stopping of the air can be perceived.

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（）s are sounds produced without obstruction, so no turbulence or a total stopping of the air can be perceived.

正确答案：Vowel

Tags:obstruction turbulence perceived

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1.Phonetics studies how speech sounds are produced, transmitted, and perceived.
2.Vowels are sounds produced without obstruction, so no turbulence or a total stopping of the air can be perceived.
3.（）s are sounds produced without obstruction, so no turbulence or a total stopping of the air can be perceived.
4.For flight safety, do not open the luggage compartment during turbulence.
5.For flight safety, do not open the luggage compartment during turbulence.（）
6.Cabin service would be suspended during turbulence.