underwater crossing的意思|示意

The underwater tunnel for crossing river is an important scheme in the project of Taizhou highway.

隧道过江方案是泰州公路过江通道工程中的一个重要方案。

Both wet and dry underwater welding operations are presented to repair the burst at the welding seam of large size crossing steel pipe.

介绍了大口径过河钢管接口焊缝爆漏现象，以及湿法和干法水下焊接修复技术。

Nearly 200 years later, men could remain underwater for weeks at a time while crossing the globe on a submarine with a nearly limitless supply of power and the means to destroy several large cities.

将近200年之后，在环游世界时，人们已经可以乘坐潜艇在水下一次呆上几个星期，潜艇的能量也几乎没有限制，其上还有能摧毁数座大型城市的武器。