The Harvard Mark I had roughly 3500 relays.

哈佛马克 1 号 (Harvard Mark I) 有大约 3500 个继电器。

One of the largest electro-mechanical computers built was the Harvard Mark I, completed in 1944 by IBM for the Allies during World War 2.

最大的电子计算机之一叫做哈佛马克 1 号 (Harvard Mark I)， 于1944年在第二次世界大战中由 IBM 为同盟国而建造。

That might seem pretty fast, but it’s not fast enough to be useful at solving large, complex problems. The Harvard Mark I could do 3 additions or subtractions per second; multiplications took 6 seconds, and divisions took 15.

这可能看起来很快， 但它还不够快， 无法解决大型、复杂的问题。Harvard Mark I 每秒可以做 3 次加法或减法； 乘法用了 6 秒， 除法用了 15 秒。