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It finds its prey by detecting the minute electric fields produced by muscles when they contract, including the hard muscles, something no animal can ever switch off.
它通過探測包括心肌在內(nèi)的肌肉收縮所產(chǎn)生的微電場來尋找獵物，心肌收縮是任何生物都不能停止的。
But they do have to swim directly over a beating heart to know that it's there.
但它們需要游到這顆心臟的上方才能感知位置。
By sucking and blowing, the sting-ray escavates its target deep under the soft sand.
通過吸和吹，這只刺鰩將細(xì)沙下的獵物挖了出來。
Many rays feeding together reduces series of florals on the seafloor, but all that puffing and blowing can attract unwelcome attention.
許多一起覓食的鰩在海床上制造了一連串的沙溝，而吞云吐霧會招來不懷好意的關(guān)注。
The hunter can just easily become the hunted.
獵手很容易變成獵物。
This is the sting-ray's worst nightmare,a great hammer-head shark.
這是刺鰩最大的噩夢，一條無溝雙髻鯊。
It has electric receptors,too.
它也有電感受器。
They spread across the underside of its very broad head, which sweeps back and forth, searching for prey.
它們分布在雙髻鯊寬腦袋的下底面，腦袋來回?fù)u動尋找獵物。
The sting-ray has a formidable weapon, a venomous barb, but one hammer-head was found with 96 barbs in its body, and see none the worth.
刺鰩有一種強(qiáng)大的武器毒刺，但是曾在一條雙髻鯊身上發(fā)現(xiàn)過96根這樣的毒刺。
