sensitive pit
英 美
New World vipers with hollow fangs and a heat-sensitive pit on each side of the head.
新大陆角蝰，头的每侧长有空心毒牙和对热敏感的凹槽。
They were placed in a small pit and a referee irritated their sensitive antennae to goad them into attacking one and another.
它们被放在一个小罐子里，裁判逗弄它们敏感的胡须去激怒它们互相攻击。
The pit organs are highly sensitive to infrared ray and so are called infrared organs.
这种凹陷器官对红外射线非常敏感，因此也称为红外线感受器官。
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