access by key

基本解釋

In all cases, the return value of the method can be processed using a foreach() loop, and you can also access specific values by key as needed.
所有方法的返回值都可用 foreach() 循環(huán)來處理，需要的話也可按鍵訪問特定的值。
When you specify a caption for your menu item, you can also specify an access key by placing an '&' before the character to be used as the access key.
為菜單項指定標(biāo)題時，還可以通過在要用作訪問鍵的字符前放置一個“&”來指定訪問鍵。
The KeyedFile class represents a system file that has access by key while the SequentialFile class represents a system file that has access by record number.
KeyedFile 類表示一個通過密鑰訪問的系統(tǒng)文件，而 SequentialFile 類表示一個通過記錄編號訪問的系統(tǒng)文件。

As you can see in the screen shot below (from the Ars Technica article), you can provide links to your files (either containing the key so someone can access them directly or by providing them with the key separately) but you are prompted with a caution about not transmitting the keys through insecure channels and a far-reaching copyright warning.
FORBES: Kim Dotcom's New MEGA Encrypted Cloud Storage: See No Evil, Store No Evil
Julian Sanchez of the Cato Institute has previously pointed out that a downside to creating an easy access key for the feds, is that an easy access key then exists and can be stolen by hackers.
FORBES: Law Enforcement Wants To Be Able To 'Tap' Skype, Facebook and BlackBerry Emails
Unless the Canadian government accedes to his views, he seems ready to put the brakes on future oil sands development by curtailing Canadian access to its key export market.
FORBES: Liberal California Politician Holding Oil Sands Hostage