In colder weather, your cat will curl up into a tight, heat-conserving ball.天气更冷时，猫会为了保存热量而紧紧地缩成一团。A blow to the stomach made him curl up.他腹部受到一击而直不起腰来.On the battlefield such a coward like him would surely lie down and ...
Carcinoma of the oesophagus usually extends by local invasion and lymphatic spread.食管癌通常通过局部浸透和淋巴扩散而扩展.The lacteals of villi are part of the lymphatic system.绒毛的乳糜管是淋巴系统的一部分.Lymph nodes are round or bean - shaped structu...