英语中倍数的表达法该如何掌握?

表示倍数时用。。。
times that(or its original)length/size
或者。。。times as long/large as

...the total length of roads and streets is well over 10 times that length.

The ...is three times as tall as a man.

例如3倍
3 times as +adj.+as +代.
3 times bigger than +代。
3 times +n .+ of