For three weeks a big operation went on to recover the wreckage from the seabed.
一项大规模行动持续3周以从海床寻找残骸。
《柯林斯英汉双解大词典》
2
The fried egg jellyfish, also known as medusa, produce eggs that are fertilized in sea water, which then develop into a tiny larva fixed to seabed organisms.
煎蛋水母，也被称为美杜莎水母，它的卵在海水中受精，然后发育成固定在海床有机体上的微小幼虫。
3
'The sea [bed] is not only deep but mountainous,' Arslanian said.