Your cardiovascular system is an important and fragile group of structures that pumps nutrient - and oxygen-rich blood throughout your body.
你的心血管系统是一组重要而脆弱的结构，它输送你身体富含营养和氧气的血液。
Your cardiovascular system is an important and fragile group of structures that pumps nutrient - and oxygen-rich blood throughout your body.
你的心血管系统是一组重要而脆弱的结构，它输送你身体富含营养和氧气的血液。
应用推荐