It's a defense mechanism of the Christmas tree worm, most of which resides in a tunnel it carves into live coral.
这是圣诞树蠕虫的防御机制，它们中的大多数栖身在活珊瑚上挖出的“地道”里。
They have to worm their way through the narrow tunnel.
他们得钻过狭窄的隧道。
They had to worm their way through the narrow tunnel.
他们得钻过狭窄的隧道。
They had to worm their way through the narrow tunnel.
他们得钻过狭窄的隧道。
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