1. This machine has been specially adapted for use underwater.
    这机器是为水下使用而特别改装的.

2. The towers are built on immense underwater platforms made of steel and concrete.
    塔身建在巨大的水下钢盘混凝土平台上。

3. And the existence of underwater features of considerable magnitude.
    水下特征差异极大。

4. During my last dive in the finals, I enjoyed for the last time the quietness underwater and then swam to the side of the pool.
    在决赛的最后一跳时，我最后一次领略了水下的宁静，然后我游到池边。

5. A game that is very popular with these swimmers is the underwater tricycle race.
    这些幼小的游泳运动员非常喜爱的一项运动就是水下三轮车比赛。

6. A game that is very popular with these young swimmers is the underwater tricycle race.
    这些幼小的游泳运动员非常喜爱的一种游戏是水下三轮车比赛。

7. Some submarines carry many men and stay underwater for several weeks.
    有些潜水艇能装很多人，并在水下呆好几个星期。