diff --git a/src/interpreter/mod.rs b/src/interpreter/mod.rs
index 26d842c..3d0b133 100644
--- a/src/interpreter/mod.rs
+++ b/src/interpreter/mod.rs
@@ -71,18 +71,30 @@ impl std::fmt::Debug for Value {
     }
 }
 
+impl Value {
+    /// 容器内值的格式化：字符串加引号以区分类型，其余类型用 Display
+    fn fmt_element(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Value::String(s) => write!(f, "\"{}\"", s),
+            other => write!(f, "{}", other),
+        }
+    }
+}
+
 impl fmt::Display for Value {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
             Value::Number(n) => write!(f, "{}", n),
-            Value::String(s) => write!(f, "\"{}\"", s),
+            Value::String(s) => write!(f, "{}", s),
             Value::Bool(b) => write!(f, "{}", b),
             Value::Nil => write!(f, "nil"),
             Value::Object(obj) => {
                 let obj = obj.borrow();
                 write!(f, "{{ ")?;
                 for (key, value) in obj.iter() {
-                    write!(f, "{}: {}, ", key, value)?;
+                    write!(f, "{}: ", key)?;
+                    value.fmt_element(f)?;
+                    write!(f, ", ")?;
                 }
                 write!(f, "}}")
             },
@@ -93,7 +105,7 @@ impl fmt::Display for Value {
                     if i > 0 {
                         write!(f, ", ")?;
                     }
-                    write!(f, "{}", val)?;
+                    val.fmt_element(f)?;
                 }
                 write!(f, "]")
             },