水下探索比太空飞行便宜多了。
Underwater exploration is so much cheaper than space flight.
当我继续水下探索时，我注意到无论我游到哪里，那个年轻人也游到那里。
As I continued my underwater exploring, I noticed that everywhere I swam, he swam.
奥巴马星期五在宾夕法尼亚州匹兹堡的卡内基-梅隆大学发表讲话，并观看微型机器人水下探索和检查下水管道是否有泄漏和裂纹。
He gave the address at Carnegie Mellon University in Pittsburgh, Pennsylvania, where on Friday he watched a display of mini-robots that explore water and sewer pipes looking for leaks and cracks.
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