许多东西现在的价钱是一年前的两倍。
DNA序列重排的成本在90年代中期是每个碱基对一美元，而现在的价钱是当时的十分之一，而且人工合成分子的成本也大大降低。
The cost of sequencing DNA has fallen from about $1 per base pair in the mid-1990s to a tenth of a cent today, and the cost of synthesising the molecule has also fallen.
也许有一天我们能付得起价钱的时候，你就可以拥有它们，但现在不行。
Maybe some day when we can afford it, you can have them, but not right now.
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