什么是礁礁是位于水道中的海脊、小山或块状堆积物,它挺立在所沉积的泥土和岩石上。在浅水域、近海、大陆架或稍远处,以及大陆隆上可以发现礁石。浅水礁一般很坚固,而且大多能抵御海浪。但对于航行来说,礁石的存在却是个威胁。 What is a reef is located in the waterway ridge, hills or massive deposits, it stands in the deposited soil and rock. Reefs can be found in shallow waters, offshore, on the continental shelf or slightly further, and on the uplands. Shallow reefs are generally strong and mostly resist the waves. But for navigation, the presence of reefs is a threat.