The second tar reads an archive from stdin and expands it in place; the hyphen used with the extract (x) option refers to stdin.

第二个tar命令从stdin读取归档文件并进行展开，展开(x)选项后面使用的连字号表示stdin。

youdao

Rather, it takes your data as input and expands it to create indices across multiple dimensions, which enables you to quickly query that data.

它把你的数据作为输入，然后给数据增加多个维度的索引，以便你能快速地查询数据。

youdao

If metal gets hot it expands.

金属受热就膨胀。

《牛津词典》

And it expands the number of officials dramatically.

如此一来,官员的数目急剧增加

耶鲁公开课 - 欧洲文明课程节选

And then it expands.

然后不断扩大。

哈佛公开课 - 幸福课课程节选

It expands. You change your constraints on your system, you heat it up some more, then you take the heat source away, and you put it back in contact with the atmosphere. And you cool it a little bit, change the constraints, cool it a little bit more, and heat, and you've got a closed cycle engine.

让它与大气接触冷却,改变约束，使它继续冷却，然后又再次加热,这就是循环热机，我们以前也研究过，更复杂的机器。

麻省理工公开课 - 热力学与动力学课程节选

The innovation announced today takes advantage of the machine-to-machine capability and expands it to other devices on the network that can receive IP based commands.

ENGADGET: Ube WiFi Smart Dimmer to receive customized multitouch gesture control

As the gas expands it drives a piston that delivers energy.

CNN: Lab develops engine for the future

Roth expands it into a rich Louisiana picaresque, ranging far and wide as Benjamin tastes romance in Russia with the wife of an English diplomat (a beguiling Tilda Swinton), comes off second-best in an encounter with a German U-boat, and pursues Daisy, the love of his life, first to New York and then to Paris.

CNN: Review: 'Benjamin Button' amazes, moves