hemal system的用法和样例：
例句
- The pancreatic vasculature is one of the very important yet most complicated components of the splanchnic vascular system of the upper abdomen.
胰腺的血管是上腹部内脏血管系统非常重要而又复杂的组成部分之一。 - The roach vascular system is much less extensive and lacks tiny capillaries, Kunkel notes, so pressure can be significantly lower.
康凯尔指出，蟑螂的血管系统规模小很多，也没有微血管，所需要的血压相对低得多。
