underprep.低于；在 ... 下；在 ... 内；在 ... 控制下adv.在昏迷中；在 ... 下adj.下面的；从属的；少于的under arm在腋下

1. Construction of China's second undersea tunnel has kicked off yesterday in Qingdao City, east China's Shandong Province.
   中国的第二条海底隧道昨天在中国东部的山东省青岛市举行了开工仪式。
2. The WHC is a dual three-lane, immersed-tube road tunnel linking the West Kowloon Expressway with the Western District.
   西区海底隧道是一条双程三线沉管行车隧道，连接西九龙快速公路与港岛西区。