这两个术语经常用来描述各种业务目标和技术需求，从纯硬件可用目标到任务关键型目标。

These terms often describe a variety of business goals and technical requirements, from hardware-only availability targets to mission-critical targets.

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最简单、最常用的技术是直接将事件处理程序附加到目标上，过去，浏览器只支持这种技术。

The easiest and most common technique is to attach event handlers right at the target, and once upon a time this technique was all that browsers supported. However, this often isn't practical.

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在水下目标跟踪中，无源被动定位技术是常用的技术。

Passive localization algorithm is often used in the underwater target tracking.

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