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<p>These are the necessary steps:</p>
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<li>Intert Key</li>
<li>Turn key <strong>clockwise</strong></li>
<li>Push accelerator</li>
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<p>Do <em>not</em> push the brake at the same time as the accelerator.</p>
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<p><b>注释：</b>必须声明 DOCTYPE，这样 :first-child 才能在 IE 中生效。</p>
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