Finally, we put the whole lot in parentheses to make a command list and put the entire list in the background using an ampersand.

最后，我们将所有代码放在一对圆括号中构成一个命令列表，然后使用与号将整个列表放到后台。

youdao

If you want to make sure both conditions are true and they both have to be true for any code to be executed, use ampersand ampersand.

如果你想保证两个条件都成立,或者它们两个都必须为真值，才能执行一些代码，那就使用“&&

youdao

They use the percent (%) symbol instead of the ampersand, and can be either named entities or external entities.

它们使用百分号（%）而不是与字符，可以是命名实体或外部实体。

youdao

If you want to make sure both conditions are true and they both have to be true for any code to be executed, use ampersand ampersand.

如果你想保证两个条件都成立,或者它们两个都必须为真值，才能执行一些代码，那就使用“&&“

哈佛公开课 - 计算机科学课程节选

Y I'm not passing an x and I'm not passing a Y, &y I'm passing an ampersand x and ampersand y and can you take a guess as to what the ampersand operator must mean?

我不是传递X，也不是传递，我传递的是&x和,你们可以猜一猜,这个&符号是什么意思？

哈佛公开课 - 计算机科学课程节选

You'll need a password of 7 to 12 characters, one uppercase, one lowercase, one number and, preferably, one character like an exclamation point or ampersand.

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