[reportlab-users] the size of the lower_part of a character

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Hello:
    First ,I'm a Chinese and my English is not very good,so there maybe    some wrongs in my words,please forgive me.
   My question is:
    How Can I know  the size of the lower_part(I don't know how describe  it correctly) of a character?Is it has some relation to it's fontsize?
   Can you understand me?



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<DIV>Hello:</DIV>
<DIV>&nbsp;&nbsp;&nbsp; First ,I'm a Chinese and my English is not very good,so there maybe&nbsp;&nbsp;&nbsp; some wrongs in my words,please forgive me.</DIV>
<DIV>&nbsp;&nbsp; My question is:</DIV>
<DIV>&nbsp;&nbsp;&nbsp; How Can I know&nbsp; the size of the lower_part(I don't know how&nbsp;describe &nbsp;it correctly) of a character?Is it has some relation to it's fontsize?</DIV>
<DIV>&nbsp;&nbsp; Can you understand me?</DIV><p><br><hr size=1><b>Do You Yahoo!?</b><br>
<a href="http://cn.rd.yahoo.com/mail_cn/tag/SIG=1402c0to2/**http%3A%2F%2Fhp.allyes.com%2Flaserjet%2Fgamestory%2Findex.html%3Fjumpid%3Dex_hphqapcn_MongooseLJ1010%2F201073CN407016%2FYahoo" target=blank>»ÝÆÕTTÓÎÏ·¾ç£¬ÍæÓÎÏ·£¬Öд󽱣¡</a>
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