明确标示每个链接的目标。保持导航结构和命名的可见性，而不要隐藏它们，不要直到用户触发一个事件(比如鼠标移过)才显示。

Clearly indicate each link's destination. Keep navigation structures and nomenclature visible, rather than hiding them until the user has triggered an event (such as a mouse over).

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实际上，SVG 允许嵌入 sciplet（ECMAScript），它可以包含很多事件，比如鼠标悬停、鼠标移出、单击等。

In fact, SVG allows you to embed sciplets (ECMAScript), which can include events like mouse-over, mouse-out, click, and so on.

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这些事件包含有帮助的信息，比如事件类型和鼠标在页面上的当前位置。

These events include helpful information, such as the event type and the current position of the cursor on the page.

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