密歇根州安阿伯市——学者经常通过筛选千里之外异国落满灰尘的档案发现学术瑰宝。
ANN ARBOR, mich.-scholarly gems are often found by sifting through dusty archives in foreign lands thousands of miles away.
到目前为止，通过筛选方法出生的婴儿已有超过20个，这种方法可以检验出染色体异常。
So far, more than 20 babies have been born using the screening programme, which checks for chromosome abnormalities.
这样，上述序列中的第二和第三个Sell事件将无法通过筛选器，这就是您希望的结果。
The second and third Sell events in the sequence described above would then fail the filter, which is what you want. To add this condition to the filter, do the following.
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