diff --git a/src/framework/struct.h b/src/framework/struct.h
index 13bcaad..742e6aa 100644
--- a/src/framework/struct.h
+++ b/src/framework/struct.h
@@ -40,13 +40,16 @@ typedef SourceProvider_t MirrorSite_t;
 
 SourceProvider_t UpstreamProvider =
 {
-  /* 引入新的上游默认源时，请使下面第一行的前三个字段保持不变，只添加第四个字段 */
+  /* 引入新的上游默认源时，请使下面第一行的前三个字段保持不变，只添加第四个字段，可使用 def_upstream 宏 */
   "upstream", "Upstream", "上游默认源", NULL,
-  /* 引入新的上游默认源时，请完全修改下面这个结构体 */
+  /* 引入新的上游默认源时，请完全修改下面这个结构体，可使用 def_need_measure_info 宏 */
   {SKIP, "URL未知，邀您参与贡献!", "URL unknown, welcome to contribute!", NULL}
-},
+};
 
-UserDefinedProvider =
+#define def_upstream            "upstream", "Upstream", "上游默认源"
+#define def_need_measure_info   {SKIP, "缺乏较大的下载对象，邀您参与贡献!", "Lack of large object URL, welcome to contribute!", NULL}
+
+SourceProvider_t UserDefinedProvider =
 {
   "user", "用户自定义", "用户自定义", NULL,
   {SKIP, "用户自定义源不测速", "SKIP for user-defined source", NULL}
diff --git a/src/recipe/lang/Rust/Cargo.c b/src/recipe/lang/Rust/Cargo.c
index 70f01fe..3d07beb 100644
--- a/src/recipe/lang/Rust/Cargo.c
+++ b/src/recipe/lang/Rust/Cargo.c
@@ -3,18 +3,25 @@
  * -------------------------------------------------------------
  * File Authors  : Aoran Zeng <ccmywish@qq.com>
  * Contributors  :  Nil Null  <nil@null.org>
+ *               |
  * Created On    : <2023-08-30>
- * Last Modified : <2024-10-02>
+ * Last Modified : <2024-12-18>
  * ------------------------------------------------------------*/
 
+static SourceProvider_t pl_rust_cargo_upstream =
+{
+  def_upstream, "https://crates.io/",
+  def_need_measure_info
+};
+
 /**
- * @update 2024-10-02
+ * @update 2024-12-18
  * @note 以下都支持稀疏索引，我们换源时都将默认添加 `sparse+`
  * @note 链接末尾的 `/` 不能缺少
  */
 static Source_t pl_rust_cargo_sources[] =
 {
-  {&UpstreamProvider,      "https://index.crates.io/"}, // @help 是这个吗？
+  {&pl_rust_cargo_upstream,  "https://index.crates.io/"}, // @help 是这个吗？
   {&MirrorZ,       "https://mirrors.cernet.edu.cn/crates.io-index/"},
   {&Sjtug_Zhiyuan, "https://mirrors.sjtug.sjtu.edu.cn/crates.io-index/"},
   {&Tuna,          "https://mirrors.tuna.tsinghua.edu.cn/crates.io-index/"},