diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 2f2626a..1173edc 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -1456,15 +1456,15 @@
 								- R&D for new businesses
 								- R&D for exploratory research
 						- **Screen** opportunities
-							- Purpose:
+							- Purpose: #flashcard
 								- to eliminate any opportunities that are **unlikely to result in the creation of value**,
 								- to focus attention on the opportunities **worthy of further investigation**
 								- **not to** pick the _single best opportunity_!
-							- Approach:
+							- Approach: #flashcard
 								- Web-based **surveys**
 								- Workshops with **multi-voting**: collaborative sessions or meetings where participants engage in a voting process to prioritize or make decisions on various options or ideas.
 						- Develop **promising opportunities**
-							- Details
+							- Details #flashcard
 								- customer interviews,
 								- testing of existing products,
 								- concept generation,