In cases where dynamic typing is more convenient, the dynamic type can be used, enabling arbitrary access to properties and methods on dynamic variables.

有些情况下，动态类型更方便，我们可以使用Dynamic类型，从而可以对Dynamic变量的属性和方法进行任意地访问。

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Ultimately, such a model arrives at a cross roads where it has to either limit access in an arbitrary way, or face uncontrolled cost increases.

FORBES: Uncommon Sense

The website did not prevent unauthorized access, allowed anyone to access the feature, and allowed arbitrary data to be passed in.

FORBES: iPad Owners' Security Breached

Visiting a maliciously crafted web page may allow access to JavaScript objects or the execution of arbitrary JavaScript in the context of another web page.

ENGADGET: Apple releases Windows Safari 3.0.1, squishes security bugs