Warning: file_put_contents(): Only 0 of 5853 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/001308.com/index.php on line 55 自拍偷区亚洲综合第二区,久久久久精品国产首页免费,女生宿舍
1. N the valve between the left atrium and the left ventricle of the heart, consisting of two membranous flaps, that prevents regurgitation of blood into the atrium 二尖瓣 (Also called bicuspid valve)