This is not scalable, and also when you do things by hand, even in the best laboratories, you have variations in techniques, and you need to know, if you're making a drug, that the Aspirin you're going to take out of the bottle on Monday is the same as the Aspirin that's going to come out of the bottle on Wednesday.
无法批量操作，而且由于是靠手工完成， 即使是在最好的实验室， 操作技术也不可能完全稳定。 此外，从事制药工作的人必须知道， 预备周一从瓶子中取出来的阿司匹林 和预备周三取出来的阿司匹林， 必须是一样的。