我一直很难理解Javascript语言的继承机制。 它没有”子类”和”父类”的概念，也没有”类”（class）和”实例”（instance）的区分，全靠一种很奇特 ...

These dogs are invaluable for security ... The researchers have developed a prototype based on odor receptors grown from the genes of mice that respond to target odors, including the smells ...