diff --git a/version2.0/nasal_gc.h b/version2.0/nasal_gc.h
index 2be2c8c..5031457 100644
--- a/version2.0/nasal_gc.h
+++ b/version2.0/nasal_gc.h
@@ -139,20 +139,20 @@ struct memory_block
 	gc_unit space[NAS_POOL_SIZE];
 };
 
-class memory_block_list
+class memory_block_base
 {
 private:
 	std::vector<memory_block*> mem_page;
 	int mem_size;
 public:
-	memory_block_list()
+	memory_block_base()
 	{
 		mem_size=0;
 		memory_block* tmp=new memory_block;
 		mem_page.push_back(tmp);
 		return;
 	}
-	~memory_block_list()
+	~memory_block_base()
 	{
 		mem_size=0;
 		int page_size=mem_page.size();
@@ -209,7 +209,7 @@ private:
 	then all the things will be moved to a new space,
 	at this time if you reference a member in it,this will cause segmentation error.
 	*/
-	memory_block_list memory;
+	memory_block_base memory;
 	bool error_occurred;
 public:
 	void gc_init()
diff --git a/version2.0/nasal_runtime.h b/version2.0/nasal_runtime.h
index 261477a..8a24f46 100644
--- a/version2.0/nasal_runtime.h
+++ b/version2.0/nasal_runtime.h
@@ -4,8 +4,8 @@
 std::string inline_func_name[nas_lib_func_num]=
 {
     //base.nas
-    "nasal_call_inline_push_back",
-    "nasal_call_inline_set_size",
+    "nasal_call_inline_push_back",// append
+    "nasal_call_inline_set_size", // setsize
     "nasal_call_inline_subvec",
     "nasal_call_inline_contains",
     "nasal_call_inline_delete",
@@ -29,7 +29,7 @@ std::string inline_func_name[nas_lib_func_num]=
     "nasal_call_built_in_setbit",
     "nasal_call_built_in_null_string_gen",
     //io.nas
-    "nasal_call_inline_c_std_puts",
+    "nasal_call_inline_c_std_puts",// print
     //math.nas
     "nasal_call_inline_sin",
     "nasal_call_inline_cos",
@@ -39,7 +39,7 @@ std::string inline_func_name[nas_lib_func_num]=
     "nasal_call_inline_cpp_math_sqrt",
     "nasal_call_inline_cpp_atan2",
     //system.nas
-    "nasal_call_inline_scalar_type"
+    "nasal_call_inline_scalar_type"//system.type
 };
 
 class nasal_runtime
@@ -116,7 +116,7 @@ class nasal_runtime
         int  conditional        (std::list<std::map<std::string,int> >&,abstract_syntax_tree&);
         int  block_proc         (std::list<std::map<std::string,int> >&,abstract_syntax_tree&);
         int  func_proc          (std::list<std::map<std::string,int> >&,std::list<std::map<std::string,int> >&,abstract_syntax_tree&,abstract_syntax_tree&,abstract_syntax_tree&,int);// checked
-        int  inline_function    (std::list<std::map<std::string,int> >&,std::string);
+        int  builtin_function   (std::list<std::map<std::string,int> >&,std::string);
     public:
         nasal_runtime()
         {
@@ -2314,7 +2314,7 @@ int nasal_runtime::call_identifier(std::list<std::map<std::string,int> >& local_
         for(int i=0;i<nas_lib_func_num;++i)
             if(inline_func_name[i]==tmp_id_name)
             {
-                addr=inline_function(local_scope,tmp_id_name);
+                addr=builtin_function(local_scope,tmp_id_name);
                 break;
             }
         if(addr>=0)
@@ -2997,11 +2997,12 @@ int nasal_runtime::func_proc(
     local_scope.pop_back();
     return function_returned_addr;
 }
-int nasal_runtime::inline_function(std::list<std::map<std::string,int> >& local_scope,std::string func_name)
+int nasal_runtime::builtin_function(std::list<std::map<std::string,int> >& local_scope,std::string func_name)
 {
     int ret_addr=-1;
     if(func_name=="nasal_call_inline_push_back")
     {
+        // append
         int vector_addr=-1;
         int elements_addr=-1;
         for(std::list<std::map<std::string,int> >::iterator i=local_scope.begin();i!=local_scope.end();++i)
@@ -3058,6 +3059,7 @@ int nasal_runtime::inline_function(std::list<std::map<std::string,int> >& local_
     }
     else if(func_name=="nasal_call_inline_set_size")
     {
+        // setsize
         int vector_addr=-1;
         int size_addr=-1;
         for(std::list<std::map<std::string,int> >::iterator i=local_scope.begin();i!=local_scope.end();++i)
@@ -3119,6 +3121,7 @@ int nasal_runtime::inline_function(std::list<std::map<std::string,int> >& local_
     }
     else if(func_name=="nasal_call_inline_c_std_puts")
     {
+        // print
         int vector_addr=-1;
         for(std::list<std::map<std::string,int> >::iterator i=local_scope.begin();i!=local_scope.end();++i)
             if(i->find("dyn")!=i->end())
@@ -3145,6 +3148,7 @@ int nasal_runtime::inline_function(std::list<std::map<std::string,int> >& local_
     }
     else if(func_name=="nasal_call_inline_scalar_type")
     {
+        // system.type
         int data=-1;
         for(std::list<std::map<std::string,int> >::iterator i=local_scope.begin();i!=local_scope.end();++i)
             if(i->find("thing")!=i->end())