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1��(Introduction)

�ڿ��ٳ��л��c��I(y��)��p��,��к��l(xi��ng)��֮�g�໥�B͸,��Ӱl(f��)չ�đB(t��i)�ݷǳ��@,��ߵĽ��څģ��,�ڳ��߅��u�γ�һ�N��@�^��Ժ̈́ӑB(t��i)��ĵ��,��y(t��ng)�ĳ��l(xi��ng)��ԪՓ�ѽ�(j��ng)�o��@�N��΄��M(j��n)�М�(zh��n)�_ԏ�,��Ǉ��H��ЌW(xu��)��˰��л��؅^(q��)�ĸ��(Iaquinta et al.,2000;Webster,2002)

��Y(ji��)��^(q��)��(n��i)��l(xi��ng)��û��s��e,��(j��ng)��(j��)�Y(ji��)��(g��u)��׃��,��a(ch��n)�I(y��)�c�͘I(y��)�Y(ji��)��(g��u)��r(n��ng)��ˮƽ�ߵ��a(ch��n)�I(y��)�c�˿ڿ��g��۶ȵ͵��@��c(di��n)(��ҵ�,2009;Makitaet al.,2010).��л��؅^(q��)�Ľ�(j��ng)��(j��)��L��Ѹ��л��,�҇��M(j��n)��ٳ��л��A��֮��,ԓ�^(q��)��՝u�ɞ��аl(f��)չ��c(di��n)�Լ��л��о��ğ��c(di��n)(Ginsburg et al.,1991;Zhao et al.,2009;�S��P,2009).

��л��؅^(q��)չ�_�о��_��(d��o)ԓ�^(q��)��ڳ��л��M(j��n)��еİl(f��)չ��,ͨ�^��Ҏ(gu��)��c��,��Ԝp�ٻ��ڳ��л��^��п��ܳ��F(xi��n)�ĸ��Nؓ(f��)��Ӱ�.

Ŀǰ��(n��i)�⌦�ڰ��л��؅^(q��)��о��༯��Єeָ��(bi��o)�wϵ(��G�õ�,2003)��(q��)��ط��

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