修复一些错误并更新README

PublicTypes/ExpressionContext.cs

@@ -8,6 +8,9 @@ using Flee.Parsing;
 
 namespace Flee.PublicTypes
 {
+    /// <summary>
+    /// 表达式上下文类，提供表达式编译和执行的环境
+    /// </summary>
     public sealed class ExpressionContext
     {
 
@@ -186,11 +189,22 @@ namespace Flee.PublicTypes
             return this.CloneInternal(true);
         }
 
+        /// <summary>
+        /// 编译动态表达式，返回类型在运行时确定
+        /// </summary>
+        /// <param name="expression">要编译的表达式字符串</param>
+        /// <returns>编译后的动态表达式</returns>
         public IDynamicExpression CompileDynamic(string expression)
         {
             return new Flee.InternalTypes.Expression<object>(expression, this, false);
         }
 
+        /// <summary>
+        /// 编译泛型表达式，返回指定类型的结果
+        /// </summary>
+        /// <typeparam name="TResultType">表达式结果的类型</typeparam>
+        /// <param name="expression">要编译的表达式字符串</param>
+        /// <returns>编译后的泛型表达式</returns>
         public IGenericExpression<TResultType> CompileGeneric<TResultType>(string expression)
         {
             return new Flee.InternalTypes.Expression<TResultType>(expression, this, true);

PublicTypes/VariableCollection.cs

@@ -7,7 +7,7 @@ using System.Reflection;
 namespace Flee.PublicTypes
 {
     /// <summary>
-    ///
+    /// 变量集合类，用于管理表达式中使用的变量
     /// </summary>
     public sealed class VariableCollection : IDictionary<string, object>
     {