׻

f U U

U,

vv , wv

U淤 UUU U UU ֋ UU U ΂ US, ׊ U U UU U Ǹ U U 緤 ⷤ U

US U ׊ U U U U (Ǹ) $ 緤 U UU , -UU U - U S 跤 UU U U U S U U U - U Ȥ U

U-US U U$U λ U UUU U U S UU U S U UǸ U U U U Uˆط氡 ע ػ U U 桿 U

緤 U UU U UUS UU U U UU U ‹U ߷ S ܻ UU-UU UU U 淤U U M U U S U

U UU U U Ȥ˻ c ( f U c ) vx M U U U S vz U U UU 淤 US U Ǹ UU U U U ׊ UU ⢁ U U Ǹ U Ǹ UU U

- U U S ٢ U 緤UU UU UǸ 桿 U -U, U, - · U U U U (·ٷ)U -S U U UU U U ɸU UU UȤ-UȤ U 桿 UU U j U U

Uׇ U U U U-U U UǸ, U, U ߋ U Q U U US, U U ׊ UU U S-L, l Ȥ˻ 梷U U UU Ȥ$ S չ M U U

U UU S U U U ٷ S U U ܰ U U U U M U U U U UǸ US U U Ȥ U U顿 U

U-U׷, U U UU ⢿U U UU Uٷ U UU U SU UU UU U U UU U ֻ UU U 淤U ֻ SU U U ܻ-ܻ U UU - U U -m ܰ U U

U ߢ ⢢ U Ǹ ⢁ U U顿U ߢ ⢿U U U S U ً U U U U Ǹ UU U U U U UU Ȥ UU UǸ U U

---