diff --git a/1000-hours/sounds-of-american-english/4.2-words.md b/1000-hours/sounds-of-american-english/4.2-words.md
index 574ada97..d62afa6d 100644
--- a/1000-hours/sounds-of-american-english/4.2-words.md
+++ b/1000-hours/sounds-of-american-english/4.2-words.md
@@ -95,6 +95,7 @@
 > * *vocabulary* <span class="pho alt">voʊˈkæbjəleri</span><span class="speak-word-inline" data-audio-us-male="/audios/vocabulary-us-male.mp3" data-audio-us-female="/audios/vocabulary-us-female.mp3"></span>
 > * *vulnerable* <span class="pho alt">ˈvʌlnɚəbəl</span><span class="speak-word-inline" data-audio-us-male="/audios/vulnerable-us-male.mp3" data-audio-us-female="/audios/vulnerable-us-female.mp3"></span>
 > * *wonderfully* <span class="pho alt">ˈwʌndɚfəli</span><span class="speak-word-inline" data-audio-us-male="/audios/wonderfully-us-male.mp3" data-audio-us-female="/audios/wonderfully-us-female.mp3"></span>
+
 </div>
 
 ## 4.2.2. 强读与弱读