To minimize the retrieval speed, all the data are kept in active memory (rather than on hard disks) on a distributed computer system consisting of about 70 PCs.

• 为了尽可能缩短检索时间，他们采用由大约70台电脑构成的分散式电脑系统，将所有的资料都存放在记忆体内（而不是在硬碟上）。