It takes two days by foot or mule to get to the bottom of the Grand canyon and back, and at least two weeks to complete the journey through the canyon by raft.
它需要两天的步行或骡子到达大峡谷的底部和背部，用木筏至少两个星期才能完成穿越大峡谷的旅程。
Then the response of the hull with floating raft system was analyzed when the bottom of hull was exerted by a vertical shock wave from an underwater explosion...
并将浮筏隔振系统和船体作为一体，研究整个船舶结构的冲击响应，所得到的结果对于研究浮筏系统的抗冲击设计具有参考价值。
Imagine standing on a rubber raft and sticking a really long straw into a pond in hopes of sipping a soft drink buried on the bottom.
想像站在橡皮艇上，用一条很长的吸管伸到水池里，期望能喝到深埋于池底的一种软饮料。
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