diff --git a/src/ui/scenes/training_room.gd b/src/ui/scenes/training_room.gd
index f570e79..9193047 100644
--- a/src/ui/scenes/training_room.gd
+++ b/src/ui/scenes/training_room.gd
@@ -145,8 +145,10 @@ func _on_player_passed(player_idx: int) -> void:
 
 func _show_table_cards(cards: Array[Card]) -> void:
 	_clear_table_cards()
-	# 按 rank 排序
-	var sorted_cards: Array[Card] = cards.duplicate(false)
+	# 按 rank 排序（用 for-loop 拷贝避免 Array.duplicate() 丢类型信息）
+	var sorted_cards: Array[Card] = []
+	for c in cards:
+		sorted_cards.append(c)
 	sorted_cards.sort_custom(func(a: Card, b: Card): return a.compare_to(b) < 0)
 	
 	var total_width := sorted_cards.size() * 60