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diff --git a/1000-hours/sounds-of-american-english/2.2.10-tʃdʒ.md b/1000-hours/sounds-of-american-english/2.2.10-tʃdʒ.md
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--- a/1000-hours/sounds-of-american-english/2.2.10-tʃdʒ.md
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# 2.2.10. `tʃ/dʒ`
-`ʃ/ʒ` 发声时舌尖贴近但没有接触到龈脊，`tʃ/dʒ` 则需要舌尖贴到龈脊，和 `t/d` 一样。。
+`ʃ/ʒ` 发声时舌尖贴近但没有接触到龈脊，`tʃ/dʒ` 则需要舌尖贴到龈脊，和 `t/d` 一样；但，无论是 `ʃ/ʒ` 还是 `tʃ/dʒ` 发声时舌背都抬得较高，舍尾抵到后牙。
-When pronouncing `ʃ/ʒ`, the tip of your tongue should be close to, but not touching, the alveolar ridge. For `tʃ/dʒ`, however, you need to touch the alveolar ridge with your tongue tip, same as when pronouncing `t/d`.
+When pronouncing `ʃ/ʒ`, the tip of your tongue should be close to, but not touching, the alveolar ridge. For `tʃ/dʒ`, however, you need to touch the alveolar ridge with your tongue tip, same as when pronouncing `t/d`. However, when pronouncing either the sounds `ʃ/ʒ` or `tʃ/dʒ`, the tongue roof should arch higher in the mouth, with the back of it touching back teeth.
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+
为了让舌尖适应那个部位，不妨反复练习：