A is倍数 + the + 名词 (size / length / weight / depth / height / width ) + of B.

　e.g The classroom is three times as large as that one.

The classroom is three times larger than that one.

The classroom is three times the size of that one.

3. In the summer of 1905, this outspoken young man was rocking his one-year-old baby when he was suddenly inspired. 在1905的夏季，这位直率的年轻人正在摇哄他的一岁大的婴儿时，突然大脑产生了一个想法。

由连词when 引起时间状语从句时，when 通常被译为"（当）......时候"。此时when 相当于and then, 主句表示一件事正在发生或即将发生，when 引起的从句则表示此时又发生了另一件事。when 常常有"突然"之意，可译为"正在......，突然......"或"正在......，这时......"。

e.g I was working in the garden when I suddenly felt a pain in my stomach.

Frank was about to leave when he noticed a letter lying on the floor.

We were on the point of giving up when the captain came up.

4. In the West magnetism was not discovered until the fifteenth century. 在西方，直到15世纪，磁力才被发现。

注意此句也可以用有关not ... until的不同句型来表达：

It was not until the fifteenth century that magnetism was discovered in the West. (强调句型)

Not until the fifteenth century was magnetism discovered in the West. (倒装句)