为什么binmodeasraw会产生元音变音？能否详细说明“Zurich”字符串在Perl中的内部存储方式？只是有点迷路。usestrict;usewarnings;my$filename="result-test-encoding-raw.xml";open(my$fh,'>',$filename)ordie"die";#binmode$fh,':utf8';#badumlautbinmode$fh,':raw';#goodumlautprint$fh'';print$fh'';my$line_text='Zürich';print$fh$line_text;print$fh'nex