Having checked the address carefully, Tom clicked the button and sent the email to his professor.

在仔细地检查了地址后，汤姆点击了按钮，把邮件发给了他的教授。

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The value of a check box or radio button is encoded only if the form element is checked.

只有当对应的表单元素被选中时，复选框和单选按钮的值才会被编码。

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Clicking the button for a topping checks both halves, but each half can be checked or cleared independently.

单击与某种浇头对应的按钮会为两半都选中浇头，但每一半都可单独选中或清除。

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