If you think two brain are going to make you smarter, but having only one spinal cord really creates a bottle neck for t如果你认为如果你有两个大脑会让你变得更聪明，但是如果你只有一个脊柱的话，你的两个大脑所要传递的信息就可能在这里造成堵塞。
The national ecnomic construction of China is meeting recently the bottle neck of the requirement with mineral resoures.摘要最近，中国的国民经济建设遭遇到矿产资源需求的瓶颈。