Adjective:

1. not provided with vents

UNTAAn.联合国技术援助局UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unfactored takeoff distance未经修正的起飞滑跑距离Uncaria lancifolia Hutch.unclassified acute leukemiaUALundamped analytical balance无阻尼的分析天平undetected block error rate未检出的块差错率unconstrained triangulation无约束三角剖分,无条件三角剖分undelivery container report集装箱未交付报告unemployment insurance Fund失业保险基金un-determined multipliers特定因子, 未定因子unfavorable balance payment支付逆差