[이벤트 위임] 과제2 해답 번역 - line 1(#1311)

Author: Violet-Bora-Lee

2-ui/2-events/03-event-delegation/2-sliding-tree/solution.md

@@ -1,4 +1,4 @@
-The solution has two parts.
+해답은 두 파트로 나뉩니다.
 
 1. Wrap every tree node title into `<span>`. Then we can CSS-style them on `:hover` and handle clicks exactly on text, because `<span>` width is exactly the text width (unlike without it).
 2. Set a handler to the `tree` root node and handle clicks on that `<span>` titles.