knock in and knock out

Knock knock a button, good and cheap goods go out thousands of miles in the factory are well aware, we do not want to think of the previous things.

敲一敲按钮，物美价廉的商品鱼贯而出，千里之外的工厂了如指掌，我们做到了以前想也不敢想的事。

Moreover, it regulates gene knock-out spatially and temporally. Conditional gene knock-out has become an important means to research gene function in vertebrates.

并且对基因敲除进行时空的调控，并成为脊椎动物成体中研究基因功能的重要手段。