7. footprint - 搜索范围 - Your footprint of your search will be really big in very deep water. 8. neutrally buoyant - 中性浮力 - The submarine is going to be neutrally buoyant, floating just at the surface. 9. signal - 发出信号 - They won't be able to signal if they've lost p...
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The Titanic was a very large British passenger ship, It hit an iceberg in the Atlantic ocean on its first journey in 1912 and sank. There were not enough lifeboats for all the passengers, and over 1, 500 passengers died. The sinking of the Titanic is well known to most people. There ...