（上面藍色字體就是系列一和二，點擊就可以！）

用盡量快速和精簡的方式講授最經(jīng)典的真題難句。

每個句子我會控制在兩分鐘以內(nèi)。

你們聽完以后需要用同樣流暢的中文重復(fù)出來。

50句之后你的句子理解能力和翻譯能力會有質(zhì)的飛躍。

09年第二篇文章第六段四句話！

第一句：

Critics also argue that commercial genetic testing is only as good as the reference collections to which a sample is compared.

第二句：

Databases used by some companies don't rely on data collected systematically but rather lump together information from different research projects.

第三句：

This means that a DNA database may differ depending on the company that processes the results.

第四句：

In addition, the computer programs a company uses to estimate relationships may be patented and not subject to peer review or outside evaluation.