2. Leaf: oval shape, with caducous awns at the tip.

叶：椭圆形，先端具一早落性之芒尖。

VTE is common and usually thrombose in venous system with the action of certain incentives, or followed with PE caused by the caducous blood clots.

VTE是外科临床常见病，通常是在一定的诱因作用下，在静脉系统内形成血栓，或并发静脉血栓脱落引起的肺动脉栓塞。