From 3f2559bce4b512adb52cd5564bff1bbbee1dd08a Mon Sep 17 00:00:00 2001
From: zyx <814780329@qq.com>
Date: Thu, 25 Jun 2026 16:17:57 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=94=B9=E4=BC=98=E5=8C=96:=204.1.2.3?=
 =?UTF-8?q?=20=E8=BF=9B=E9=98=B6=E5=AE=9E=E8=B7=B5=EF=BC=9A=E5=A4=9A?=
 =?UTF-8?q?=E8=BE=93=E5=85=A5=E5=A4=9A=E8=BE=93=E5=87=BA=E5=A4=8D=E6=9D=82?=
 =?UTF-8?q?=E7=BA=BF=E6=80=A7=E4=BB=BB=E5=8A=A1RunnableMap=E9=83=A8?=
 =?UTF-8?q?=E5=88=86?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/guide/chapter4.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/guide/chapter4.md b/docs/guide/chapter4.md
index 74021a4..45e5a17 100644
--- a/docs/guide/chapter4.md
+++ b/docs/guide/chapter4.md
@@ -208,11 +208,12 @@ marketing_prompt = PromptTemplate(
 )
 
 # 3. 多输入多输出线性链（教学标准版）
+
 overall_chain = (
     # Step 1：生成卖点 + 透传原始输入
     RunnableMap({
         "sell_points": sell_point_prompt | llm | (lambda x: x.content),
-        "target_audience": RunnablePassthrough(),
+        "target_audience": lambda x: x["target_audience"],
     })
     # Step 2：营销话术生成
     | marketing_prompt