“礁”怎么读

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他正在环礁湖里与一只短吻鳄搏斗。He was grappling with an alligator in a lagoon.岛的附近有险礁和浅滩.There are dangerous rocks and shallows near the island.这条木筏划近岩礁,然后迅速转向避开.The raft came close to the rocks and then sheered away....