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everyone-can-use-english/1000-hours/sounds-of-american-english/2.2.12-tsdz.md
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# 2.2.12. <span class="pho">ts/dz</span>
<span class="pho">ts/dz</span> 和 <span class="pho">s/z</span> 不一样的地方在于发声时起始的舌尖位置,<span class="pho">s/z</span> 起始的舌尖位置贴近但没有接触到牙齿和牙龈的接缝处;但,<span class="pho">ts/dz</span> 的舌尖要再往后一点,和 <span class="pho">t/d</span> 发声时起始的舌尖位置一样,贴在龈脊的那个部位之后开始发声。
The difference between <span class="pho">ts/dz</span> and <span class="pho">s/z</span> lies in the initial tongue position during pronunciation. For <span class="pho">s/z</span>, the tip of the tongue is close to, but not touching, the *seam* of the teeth and gums. However, for <span class="pho">ts/dz</span>, the tongue tip is a bit further back, identical to the initial position when pronouncing <span class="pho">t/d</span>. It starts pronouncing from that spot of the *alveolar ridge*.
![articulator-tongue-tip-td](/images/articulator-tongue-tip-td.svg)
可以用 *students* <span class="pho alt">ˈstudənts</span><span class="speak-word-inline" data-audio-us-male="/audios/us/students-us-male.mp3" data-audio-us-female="/audios/us/students-us-female.mp3"></span> 这个词反复体会 <span class="pho">s</span>、<span class="pho">d</span>、<span class="pho">ts</span> 的舌尖位置(注意,开头的 <span class="pho">st</span> 会被读成 <span class="pho">sd</span>)……
The word *students* <span class="pho alt">ˈstudənts</span><span class="speak-word-inline" data-audio-us-male="/audios/us/students-us-male.mp3" data-audio-us-female="/audios/us/students-us-female.mp3"></span> can be repeatedly pronounced to understand the tongue positions for <span class="pho">s</span>, <span class="pho">d</span>, and <span class="pho">ts</span> (note that the initial <span class="pho">st</span> is pronounced like <span class="pho">sd</span>).