英语词组：A是B的2倍长至少三种最常见的表达方式

A is twice of B in length.
A is twice as long as B
A is twice the length of B.
A is as long as twice the length of B.
Length of A doubles that of B.
A is of twice the length of B.
Length of A is the double of B.
A has double length of B.
A has a length of the twice of B.
A has the duplex length of B.
A is of the twofold length of B.
A is 100% longer than B.
B is a half of A in length.
B is 50% shorter than A.
...
注：twice、double、triple 最常用于口语中,在数理化表达中可用 two times、200%、three times 这些替换使用,意思相同.
is 可以用 equals 、has 等替换,twice 和 100% 可以在颠倒主谓语后以 a half 和 50% 替代.作为数理语言,实际表达方式可以有近乎无数种组合,没有对错,只有好坏、简练与否的区别.
注意,在使用longer than这种表达法时,必须注意倍数使用正确.譬如：A is 2 times （或 200%）longer than B 意味着A是B的3倍长!
最后,注意虽然有这么多的表达法,但并不代表任何表达都是对的!这里出现了不少病句.例如：A is B's double long 是错的,因为long 不是名词.A's length is double longer than B 也是错的,因为double不能像twice那样作副词使用.