VENOMOUS mammals are comparatively rare.(有毒有哺乳动物是比较稀少的。)
Probably back in some previous biology course you learned that snakes evolved from lizards, and that the first snakes weren't venomous and then along came more advanced snakes, the venomous snakes.(也许在以前的生物课上，你学过蛇是由蜥蜴进化而来的，而且最初的蛇是没有毒的，后来出现了更高级的蛇，也就是毒蛇。)
Venomous snakes spit and hiss when they are cornered.(毒蛇在无法逃脱时会发出愤怒的呼呼咝咝的声音。)
It's the female black widow spider that is venomous and displays a menacing red dot on her abdomen.(在雌性毒蜘蛛“黑寡妇”的腹部可以看到有威慑作用的红点。)
Pic.1 Venomous Jellyfish.(释放毒液的水母。)
In most venomous snakes, like vipers and cobras, the venom is used to catch and inmoblize the prey; but in colubrids, venom drips onto the prey only after the prey is in the snake's mouth.(在大多数毒蛇中，如蝰蛇和眼镜蛇，毒液用于捕捉猎物、使其无法行动；但在彩颌类中，只有在猎物到了蛇嘴里后，毒液才会滴到猎物身上。)
A venomous lionfish breaks into a huge ball of swirling baitfish.(一只有毒的狮子鱼闯进了一大群游在一起的小鱼中间。)
A very aggressive species of blank ant, the Loma ant, which has recently invaded a certain region, has a venomous sting that is often fatal to humans.(一种非常有攻击性的蚂蚁——洛玛蚂蚁，最近入侵了一个特定的区域，它们的刺有毒，对人类往往是致命的。)
What if it slithered through the window, instead crept up behind him, and struck him with its venomous fangs?(如果它从窗户进来，爬到他身后，用毒牙攻击他，那该怎么办呢？)
A couple of venomous lizards were included in this study.(这项研究包括了一些有毒的蜥蜴。)
