diff --git a/GoldfishLang.tmu b/GoldfishLang.tmu
index bcf2c936..2624ee38 100644
--- a/GoldfishLang.tmu
+++ b/GoldfishLang.tmu
@@ -1,4 +1,4 @@
-<TMU|<tuple|1.1.0|2025.0.5>>
+<TMU|<tuple|1.1.0|2025.0.4>>
 
 <style|<tuple|book|goldfish|literate|reduced-margins|python|padded-paragraphs|chinese>>
 
@@ -1519,9 +1519,9 @@
 
   <paragraph|rich-char%numeric?>
 
-  <paragraph|rich-char%upper-case?>
+  <paragraph|rich-char%upper?>
 
-  <paragraph|rich-char%lower-case?>
+  <paragraph|rich-char%lower?>
 
   <paragraph|rich-char%digit?>
 
@@ -2021,6 +2021,50 @@
     \;
   </goldfish-chunk>
 
+  <paragraph|rich-string%make-string><typehint|() =\<gtr\> rich-string>
+
+  <\goldfish-chunk|goldfish/liii/lang.scm|true|true>
+    (define (%make-string)
+
+    \ \ (rich-string (utf8-\>string (%to-bytevector))))
+
+    \;
+  </goldfish-chunk>
+
+  <subparagraph|测试>
+
+  不可见的ASCII字符
+
+  <\goldfish-chunk|tests/goldfish/liii/lang-test.scm|true|true>
+    (check ($ #\\space :make-string) =\<gtr\> " ")
+
+    (check ($ #\\return :make-string) =\<gtr\> (string #\\return))
+
+    \;
+  </goldfish-chunk>
+
+  普通的字母
+
+  <\goldfish-chunk|tests/goldfish/liii/lang-test.scm|true|true>
+    (check ($ #\\a :make-string) =\<gtr\> "a")
+
+    (check ($ #\\A :make-string) =\<gtr\> "A")
+
+    \;
+  </goldfish-chunk>
+
+  ASCII范围外的字符：希腊字母、中文、表情符：
+
+  <\goldfish-chunk|tests/goldfish/liii/lang-test.scm|true|true>
+    (check ((rich-char #xA3) :make-string) =\<gtr\> "£")
+
+    (check ((rich-char #x4E2D) :make-string) =\<gtr\> "<code|中>")
+
+    (check ((rich-char #x1F600) :make-string) =\<gtr\> "<code|😀>")
+
+    \;
+  </goldfish-chunk>
+
   <subsection|结尾>
 
   \;
@@ -2168,7 +2212,7 @@
 
     \ \ \ \ \ \ \ \ ((and (case-class? v) (v :is-instance-of 'rich-char))
 
-    \ \ \ \ \ \ \ \ \ ($ (v :to-string) :strip-prefix "#\\\\"))
+    \ \ \ \ \ \ \ \ \ (v :make-string))
 
     \ \ \ \ \ \ \ \ (else (type-error "Expected types are char, rich-char, number, symbol or string"))))
 
@@ -2188,6 +2232,8 @@
 
     (check (rich-string :value-of (rich-char #x4E2D)) =\<gtr\> "中")
 
+    (check (rich-string :value-of #\\ ) =\<gtr\> " ")
+
     \;
   </goldfish-chunk>
 
diff --git a/goldfish/liii/lang.scm b/goldfish/liii/lang.scm
index 3302f2f8..1ff9a06f 100644
--- a/goldfish/liii/lang.scm
+++ b/goldfish/liii/lang.scm
@@ -346,6 +346,9 @@
       (object->string (integer->char code-point))
       (string-append "#\\" (utf8->string (%to-bytevector)))))
 
+(define (%make-string)
+  (rich-string (utf8->string (%to-bytevector))))
+
 )
 
 (define make-rich-char rich-char)
@@ -403,7 +406,7 @@
         ((symbol? v) (rich-string (symbol->string v)))
         ((string? v) (rich-string v))
         ((and (case-class? v) (v :is-instance-of 'rich-char))
-         ($ (v :to-string) :strip-prefix "#\\"))
+         (v :make-string))
         (else (type-error "Expected types are char, rich-char, number, symbol or string"))))
 
 (define (%get) data)
diff --git a/tests/goldfish/liii/lang-test.scm b/tests/goldfish/liii/lang-test.scm
index 938e9846..b432f2a0 100644
--- a/tests/goldfish/liii/lang-test.scm
+++ b/tests/goldfish/liii/lang-test.scm
@@ -310,12 +310,23 @@
 
 (check ((rich-char #x1F600) :to-string) => "#\\😀")
 
+(check ($ #\space :make-string) => " ")
+(check ($ #\return :make-string) => (string #\return))
+
+(check ($ #\a :make-string) => "a")
+(check ($ #\A :make-string) => "A")
+
+(check ((rich-char #xA3) :make-string) => "£")
+(check ((rich-char #x4E2D) :make-string) => "中")
+(check ((rich-char #x1F600) :make-string) => "😀")
+
 (check (rich-string :value-of #\a) => "a")
 (check (rich-string :value-of 'a) => "a")
 (check (rich-string :value-of 123) => "123")
 (check (rich-string :value-of 1.0) => "1.0")
 (check (rich-string :value-of "abc") => "abc")
 (check (rich-string :value-of (rich-char #x4E2D)) => "中")
+(check (rich-string :value-of #\ ) => " ")
 
 (check ($ "abc" :get) => "abc")
 (check ($ "" :get) => "")