Warning: file_put_contents(): Only 0 of 6665 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/oclz.com/index.php on line 55 ostracum是什么意思，ostracum的翻译，ostracum音标、读音、用法和例句_菜篮子兴趣思朗文词典
For the middle layer shell (ostracum), also known as the prism of the (primatic layer) accounted for most of shellfish from Jiaozhuang calcite (cacalcite) pose. 外层皮肤从背部折皱成一层皮膜，叫做外套。外套把身体包围起来，并分泌出石灰质。