218( b )

ɮ ɮiɮh xxM x | { |

Exlx ˤE ʮn

+EESʮix EExxʺn

{EVIM +EinM֮ʴk

E<n x E nʽʺn | 1 |

En xҺҨ ʽxxʺ

iɨɺɤEx xɭvڨ bn

Eʨxɨʽʺ |n əʽn

iɨɮIx bn | 2 |

nɺɮ b

nnn ɽnMɳb

+vɨɶMɳ ɴ b

vʮ{ʴVɪʴaM{ʺn | 3 |