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1·Double kill: A play in which two outs are made with one pitch.

双杀：用一次投球使二人同时出局。

2·My extension is two four double 0 (2400).

我的分机号是2400。《牛津词典》

3·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？

4·Since technology is a double-edged sword, the development it brings and its potential threats are two sides of the same coin.

技术是一把双刃剑，因此它所带来的发展及其潜在威胁是紧密相关的。

5·Mobile telecommunications possession is expected to double in Shanghai this year as a result of a contract signed between the two companies.

由于两家公司签署了一项合同，预计今年在上海移动通信的占有量将翻一番。

6·While two of these ships sank, they were all designed with double hulls believed to make them unsinkable, perhaps a mistaken idea that led to the Titanic's and the Britannic's tragic end.

虽然其中两艘沉船沉没了，但它们都是双层船体设计，这种双层船体被认为是“永不沉没的”，也许正是这个错误的想法导致了泰坦尼克号和不列颠号的悲剧结局。

7·The payroll survey can easily double-count someone: if you are one person with two jobs, you show up as two workers.

工资调查很容易把一个人重复计算进去：如果你是一个人同时做两份工作，你就会以两名员工的身份出现。

8·Let us look at an idiom: kill two birds with double-edged sword.

我们再看一个成语：一举两得/一箭双雕。

9·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。

10·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。

双层的

1·To improve the validity of user identity authentication mechanism, a two-double authentication model integrating positive authentication mechanism and negative authentication mechanism was given.

为了提高用户身份认证的有效性，给出了一个集成肯定认证机制和否定认证机制的双层认证模型。