diff --git a/1000-hours/public/images/5-syllables-individual.svg b/1000-hours/public/images/5-syllables-individual.svg
index c8405aac..15582004 100644
--- a/1000-hours/public/images/5-syllables-individual.svg
+++ b/1000-hours/public/images/5-syllables-individual.svg
@@ -45,19 +45,19 @@
-
+
wəl
-
+
dʒə
-
+
ˈvɪ
-
+
də
-
+
ˌɪn
diff --git a/1000-hours/public/images/Speech-Tract(zh-CN).svg b/1000-hours/public/images/Speech-Tract(zh-CN).svg
index fef91f3a..23c1d540 100644
--- a/1000-hours/public/images/Speech-Tract(zh-CN).svg
+++ b/1000-hours/public/images/Speech-Tract(zh-CN).svg
@@ -4,7 +4,7 @@
-
+
硬颚
@@ -67,7 +67,7 @@
气流
-
+
软腭
diff --git a/1000-hours/public/images/articulators-cn.svg b/1000-hours/public/images/articulators-cn.svg
index 261ad47d..48f5fb93 100644
--- a/1000-hours/public/images/articulators-cn.svg
+++ b/1000-hours/public/images/articulators-cn.svg
@@ -66,7 +66,7 @@
气流
-
+
软腭
diff --git a/1000-hours/public/images/articulators-en.svg b/1000-hours/public/images/articulators-en.svg
index ad6c5083..dbac1b17 100644
--- a/1000-hours/public/images/articulators-en.svg
+++ b/1000-hours/public/images/articulators-en.svg
@@ -6,10 +6,10 @@
-
+
roof
-
+
tip
@@ -26,40 +26,40 @@
-
+
jaw
-
+
teeth
-
+
alveolar ridge
-
+
lip
-
+
lip
-
+
tongue
-
+
vocal cords
-
+
pharynx
-
+
larynx
-
+
air flow
diff --git a/1000-hours/public/images/articulators.svg b/1000-hours/public/images/articulators.svg
index 261ad47d..48f5fb93 100644
--- a/1000-hours/public/images/articulators.svg
+++ b/1000-hours/public/images/articulators.svg
@@ -66,7 +66,7 @@
气流
-
+
软腭
diff --git a/1000-hours/public/images/tongue-positions-of-vowels.svg b/1000-hours/public/images/tongue-positions-of-vowels.svg
index 3eecf993..51569899 100644
--- a/1000-hours/public/images/tongue-positions-of-vowels.svg
+++ b/1000-hours/public/images/tongue-positions-of-vowels.svg
@@ -15,78 +15,78 @@
-
+
ɪ
-
+
i
-
+
e
-
+
Central
-
+
æ
-
+
ə
ɝ
-
+
ʌ
-
+
ɔ
-
+
u
-
+
ɚ
-
+
ɛ
-
+
Front
-
+
Jaw
close
-
+
Jaw
open
-
+
Tongue Position
-
+
Back
-
+
a
-
+
ɑ
-
+
ʊ
-
+
o
-
+
High
-
+
Mid
-
+
Low
diff --git a/1000-hours/public/images/vowels-mouth-e-æ.svg b/1000-hours/public/images/vowels-mouth-e-æ.svg
index f4efdb77..752c657d 100644
--- a/1000-hours/public/images/vowels-mouth-e-æ.svg
+++ b/1000-hours/public/images/vowels-mouth-e-æ.svg
@@ -2,10 +2,10 @@