translation.en: The trick was, they were able to remove the chicken from the bone in a cost-efficient manner, which is why it took so long for people to copy them -- 10 years, then within a couple months, it was such a hit, they introduced it across the entire McDonald's system in the country.
translation.zh: 但麦乐鸡块背后的技巧是， 如何用一种划算的方式来 把鸡肉从骨头上剔出来。 这就是为什么过了这么久 才有人模仿他们。 花了十年时间， 然后在短短几个月之内， 他们就推出了麦乐鸡块， 并在全国麦当劳连锁的整个系统中都推广了，