My extension is two four double 0 (2400).

我的分机号是2400。

《牛津词典》

Two doubles, two double rooms, July 20th and 21st. Right?

四个人，两间双人间，日期是7月20日和21日，对吗？

youdao

To illustrate this, suppose you have two double arrays a and b and want to create a third array x such that x=a+b.

为了展示这一点，假设您有两个双精度的数组 a 和 b，并且要创建第三个数组 x，比如 x=a+b。

youdao

It predicts counterfeit sales will reach seventy-five billion dollars worldwide this year nearly double the level of two thousand five.

VOA: special.2010.02.22

If it goes on for ten years that means that the -it'll double in seven years, so it'd be going up like two and a half fold.

如果按照此速度过上十年就意味着,七年内价格将会翻倍,所以价格应该会上涨到两倍半

耶鲁公开课 - 金融市场课程节选

Despite what he calls overblown fears of a double-dip recession, Cardillo predicts the U.S.economy will grow between two and a half to three percent for the second half of the year.

VOA: standard.2010.07.20

Brown batted for Turner and hit a two-run double to left-center, making it 4-0 and ending Marcum's night.

WSJ: Marcum gets little help, Mets' winning streak ends

Zobrist put the Rays up 2-0 on a two-out, two-run double off Andy Pettitte (3-1) in the fifth.

WSJ: Cobb has strong start as Rays beat Yankees 3-0

Barnes hit his two-out, two-run double in the fourth to make it 5-0.

WSJ: Yankees' Pettitte struggles against Astros