设计药物的化学家就必须不停地确保这些钥匙只能开一把锁。
Chemists who design drugs keep on trying to make the key fit only one lock.
就如同为一只你从未见过的锁，制作一把钥匙一样。要想设计这样一种超级具体的微型代理装置去追查“未知的威胁”，将会是有难度的。
Like making a key for a lock you've never seen, designing an uber-specific microscopic agent to track down an "unknown threat" may prove slightly difficult.
指出包装设计是开启解决企业市场营销问题的金钥匙，也是推销产品与宣传企业形象的重要手段。
The packaging design is the gold key to solve the marketing problems of enterprises and is also a very important way to promote the products and publicize the image of corporations.
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