We need double the amount we already have.

我们需要现有数量的两倍。

《牛津词典》

Next year, I might even double the amount of time I spend fasting.

明年，我甚至可能把我禁食的时间增加一倍。

youdao

If I win the game, I'd like one grain of rice for the first square of the chessboard, two for the second, four for the third, and then double the amount for each of the rest of the squares.

如果我赢了，我想在棋盘的第一个方格里放一粒米，在第二个方格里放两粒米，在第三个方格里放四粒米，然后在剩下的方格里依次放两倍的米。

youdao

The group says that was double the amount raised in the nineteen nineties.

VOA: special.2009.06.12

I mean that's obvious. The mass, if you double the amount of stuff the mass will double.

这是显然的，还有质量，如果你把系统中物质的,数量增加一倍，质量也会增加一倍。

麻省理工公开课 - 热力学与动力学课程节选

The plan he outlined would more than double the amount of money on the negotiating table and ensure that poor countries aren't saddled by debt.

VOA: standard.2009.12.11

That's about double the amount that typically falls in the region for all of September, it said.

CNN: Japan flooding: 3 deaths, levee breaks, many missing

Captain Johan Botha has been fined double the amount in accordance to International Cricket Council regulations.

BBC: White & Hussey guide Aussies home

This unusually high demand was more than double the amount expected (due mainly to cheapness).

FORBES: Currencies, Credit Ratings and the Compact: Affairs of States