Ʊ ֱ Ȱ ǽ
û۱ڿȣȸ(ȸ:) ȸ 20 2. 20() ֱ ̰ Ͽ ε ֿջ걹 γ , ûڿ縲 Ͽ ֱ Ȱ ǽϿ. ̹ ֱ Ȱ ֱ ̺ Ʊ(ε,γ) ߵ (50~60cm) Ȱ , , ʱ ư 鿡 ֵ غϿ ̵ ֺ ֱ⸦ ǽϿ.