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One example is a trick in which a gene allows a cell, even as the drug approaches the cell,
有一個例子很神奇，基因能讓細胞在藥物接近之前，
to push the drug out, before the drug can have any effect.
把藥物推開，藥物根本來不及起任何作用。
Imagine -- the cell effectively spits out the drug.
就好比細胞一口把藥吐出去。
This is just one example of the many genetic tricks in the bag of our supervillain, cancer.
而這僅僅是我們的大反派--癌癥的眾多基因把戲之一。
All due to mutant genes. So, we have a supervillain with incredible superpowers.
這一切都跟突變基因有關。因此，我們要面對的是擁有超強能力的大反派。
And we need a new and powerful mode of attack. Actually, we can turn off a gene.
我們需要新的、更強大的攻擊方式。實際上，我們可以關閉基因。
The key is a set of molecules known as siRNA.
開關是一系列叫siRNA的分子（即小分子干擾核糖核酸）。
siRNA are short sequences of genetic code that guide a cell to block a certain gene.
它是一小段基因編碼，可以讓細胞阻止某些特定基因（發揮作用）。
Each siRNA molecule can turn off a specific gene inside the cell.
每一個siRNA都能關閉細胞內部某個特定的基因。
For many years since its discovery, scientists have been very excited about how we can apply these gene blockers in medicine.
自siRNA被發現后，科學家們興奮了好多年，因為他們可以將這種基因攔截者加入藥物中。
But, there is a problem. siRNA works well inside the cell.
但是，有一個問題。siRNA在細胞內部可以正常發揮作用。
But if it gets exposed to the enzymes that reside in our bloodstream or our tissues, it degrades within seconds.
但如果它接觸到位于我們血液或者組織中的酶的話，幾秒鐘內就會被降解。
It has to be packaged, protected through its journey through the body on its way to the final target inside the cancer cell.
因此，它們必須被包裹及保護起來，才能完成在人身體里的旅程，順利抵達最終目標--癌細胞內部。
