So we can think of the Cas9 RNA sentinel complex like a pair of scissors that can cut DNA -- it makes a double-stranded break in the DNA helix.
所以我们可以把Cas9 RNA标记复合体 想像成是一把DNA剪刀—— 它在DNA螺旋结构中， 制造了一种"双股螺旋断裂"。