n.圣族后裔，泛指早年圣徒或伊斯兰教里出身高贵的人
The shark was writhing around wildly, trying to get free.
鲨鱼拼命挣扎，试图逃脱。
The shark dived down and swam under the boat.
鲨鱼急速潜入水中，在船下游动。
a shark's dorsal fin
鲨鱼的背鳍
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