两倍

chǎn liàng shì wǔ nián qián de liǎng bèi

产量是五年前的两倍。

The output is twice as much as that of five years ago.

tā zhèng yǐ liǎng bèi yú fǎ dìng xiàn sù de sù dù xíng shǐ

他正以两倍于法定限速的速度行驶。

He was travelling at a speed that was double the legal limit.

cǐ chéng bèi liǎng bèi hòu de qiáng wéi le qǐ lai

此城被两倍厚的墙围了起来。

The city was enclosed by walls of double thickness.