If there are no truly non-venomous snakes, were the so-called non-venomous snakes, like constrictors and pythons, were they venomous at some point in their evolution?
如果没有真正的无毒蛇，那些所谓的无毒蛇，比如蟒蛇和巨蟒，在它们进化过程中的某个阶段是有毒的吗？
True to their name, boa constrictors squeeze the life out of their prey.
蟒蛇可是名副其实的猎物杀手。
In the book it said: "Boa constrictors swallow their prey whole, without chewing it."
这本书中写道：材“这些蟒蛇把它们的猎获物不加咀嚼地吞下。”
Kingsnakes are a group of beautiful constrictors found in many parts of the United States.
王蛇是一群在美国很多地方都有发现的美丽蟒蛇。
Then I would never talk to that person about boa constrictors, or primeval forests, or stars.
所以我不再提起王蛇，或原始森林，或星星。
Then I would never talk to that person about boa constrictors, or primeval forests, or stars.
然后，我就不和他讨论巨蟒、原始森林、或者星星之类的事。
"We can testify to these snakes' attraction personally, as we both have kept pet giant constrictors," the scientists wrote.
“我们可以为这些蛇类的吸引力出来作证，因为我们自己也在饲养这种巨型宠物，”这些科学家写道。
Although pet constrictors start out small and cute, the largest snakes can grow up to 20 feet long and weigh as much as 200 pounds.
虽然宠物蟒开始的时候小而可爱，但最大的蛇可以生长到20英尺长，重约200磅。
The hardy animals tolerate urban and suburban environments quite well, and boa constrictors and northern African pythons have both been spotted in the Miami metropolitan area.
顽强的动物能极好的适应城市和郊区的环境，在迈阿密市区曾发现过蟒蛇和北部非洲蟒。
The snake, named Sanajeh indicus, lacked the wide-open jaws of modern snakes such as pythons and boa constrictors and would not have been able to swallow a whole dinosaur egg.
这种蛇被命名为Sanajehindicus，不同于现在的蛇类它没有一个可完全打开的咽喉，比如蟒蛇，所以也就无法将整个恐龙蛋给吞入腹中。
The superior pharyngeal constrictor assists in gaining velopharyngeal closure, while peristaltic movement of food is facilitated by the middle and inferior pharyngeal constrictors.
咽缩上肌辅助颚咽的闭锁，而咽上缩肌和咽缩中肌使食物蠕动较容易。
In the book it said: "Boa constrictors swallow their prey whole, without chewing it. After that they are not able to move, and they sleep through the six months that they need for digestion."
书中说：“巨蟒不带咀嚼就把它的猎物囫囵吞下，然后它动弹不得，需要六个月的长眠来消化胃中的食物。”
Although the study was conducted in a lowly fruit fly, the principles uncovered by Carroll's group, he argues, very likely apply to many animals, everything from butterflies to boa constrictors.
尽管这项研究是在简单的果蝇上进行，卡罗尔的研究小组发现的原则很可能适用于许多动物，从蝴蝶到蟒蛇。
Although the study was conducted in a lowly fruit fly, the principles uncovered by Carroll's group, he argues, very likely apply to many animals, everything from butterflies to boa constrictors.
尽管这项研究是在简单的果蝇上进行，卡罗尔的研究小组发现的原则很可能适用于许多动物，从蝴蝶到蟒蛇。
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