diff --git a/1000-hours/sounds-of-american-english/1-phonemes.md b/1000-hours/sounds-of-american-english/1-phonemes.md
index 0081396b..8a592ba7 100644
--- a/1000-hours/sounds-of-american-english/1-phonemes.md
+++ b/1000-hours/sounds-of-american-english/1-phonemes.md
@@ -423,19 +423,19 @@
 
 ## 1.5. 自定义补充符号
 
-| 符号                                | 含义                                                         |
-| ----------------------------------- | ------------------------------------------------------------ |
-| <span class="pho">ɤ</span>          | 比 *schwa* <span class="pho">ə</span> 更轻的近乎于无的元音   |
-| <span class="pho">ʔ</span>          | <span class="pho">t</span> 的喉塞音版本                      |
-| <span class="pho"><u>t</u></span>   | 可选 <span class="pho">t</span>                              |
-| <span class="pho">◌̚ </span>         | 清辅音的阻塞音符号                                           |
-| <span class="pho">ᵊ</span>          | 音节辅音  <span class="pho">l, m, n, r</span> 之前的附带元音 |
-| <span class="pho">ʲ</span>          | 音节之间的加音 <span class="pho">j</span>                    |
-| <span class="pho">ʷ</span>          | 音节之间的加音 <span class="pho">w</span>                    |
-| <span class="pho">◌̅, ◌́, ◌̌, ◌̀</span> | 音节声调                                                     |
-| <span class="pho">◌̂</span>          | 音高被抬高的音节                                             |
-| <span class="pho">·</span>          | 音节之间的停顿（*pause*）                                    |
-| <span class="pho">｜</span>         | 单词之间分割意群的暂停（*pause*）                            |
+| 符号                              | 含义                                                         |
+| --------------------------------- | ------------------------------------------------------------ |
+| <span class="pho">ɤ</span>        | 比 *schwa* <span class="pho">ə</span> 更轻的近乎于无的元音   |
+| <span class="pho">ʔ</span>        | <span class="pho">t</span> 的喉塞音版本                      |
+| <span class="pho"><u>t</u></span> | 可选 <span class="pho">t</span>                              |
+| <span class="pho">◌̚ </span>       | 清辅音的阻塞音符号                                           |
+| <span class="pho">ᵊ</span>        | 音节辅音  <span class="pho">l, m, n, r</span> 之前的附带元音 |
+| <span class="pho">ʲ</span>        | 音节之间的加音 <span class="pho">j</span>                    |
+| <span class="pho">ʷ</span>        | 音节之间的加音 <span class="pho">w</span>                    |
+| <span class="pho">◌̅, ◌́, ◌̀</span>  | 音节声调，平、升、降                                         |
+| <span class="pho">◌̂</span>        | 音高被抬高的音节                                             |
+| <span class="pho">·</span>        | 音节之间的停顿（*stop*）                                     |
+| <span class="pho">｜</span>       | 单词之间分割意群的暂停（*pause*）                            |
 
 
 [^1]: 教程内音标字体选用的是 *Charis SIL*，https://software.sil.org/charis/