diff --git a/1000-hours/sounds-of-american-english/8.1-inputting-phonemes-and-symbols.md b/1000-hours/sounds-of-american-english/8.1-inputting-phonemes-and-symbols.md
index 07fb2a18..af321157 100644
--- a/1000-hours/sounds-of-american-english/8.1-inputting-phonemes-and-symbols.md
+++ b/1000-hours/sounds-of-american-english/8.1-inputting-phonemes-and-symbols.md
@@ -53,9 +53,9 @@ macOS 上有一个收费软件，[Alfred](https://www.alfredapp.com/)，可以
| `ipa8` | ◌̥ voiceless |
| `ipa9` | ◌̚ stop |
| `ipa0` | ◌ |
-| `ipa`: | ː long vowel symbol |
-| `ipa`" | ˈ prime stress |
-| `ipa`' | ˌ secondary stress |
+| `ipa:` | ː long vowel symbol |
+| `ipa"` | ˈ prime stress |
+| `ipa'` | ˌ secondary stress |
| `ipa-` | ◌‿◌ linking |
| `ipa\|` | ‖ grouping boundary |
| `-->` | ⭢ |
@@ -63,6 +63,3 @@ macOS 上有一个收费软件，[Alfred](https://www.alfredapp.com/)，可以
| `<->` | ⭤ |
| `irise` | ⤴ senetence intonation rise |
| `idown` | ⤵ senetence intonation fall |
-
-
-