5．交换血管(exchange vessels)指真毛细血管，其管壁仅由单层内皮细胞构成，外面有一薄层基膜，故通透性很高，是血管内血液和血管外组织液进行物质交换的场所。
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quick vessel-exchange 快换真空罐
This essay, basis on ballast water management experience on a voyage from Europe to US Gulf, inquire into some key points on ballast water exchange and report on vessel bound for USA.
此文以一次由西欧至美湾的压载水管理实例探讨了往美国船舶压载水更换和申报的一些要点。
The first merchant vessel to sail from New York to Canton in 1784 was on a tea-buying voyage, but the cargo it had to exchange was ginseng.
1784年第一艘由纽约驶往广州的商船就是为了购买茶叶，但它用于交换的货物却是西洋参。
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