“秘密武器”的英文是？

<p style="font-size:16px;color:#333333;line-height:30px;font-family:Helvetica,Arial,sans-serif;font-weight:normal;text-align:justify;hyphens:auto" data-flag="normal" lang="en"><b>『马丁柳地道美语每日打卡</b><b>074</b><b>』</b></p><span><br /></span><p style="font-size:16px;color:#333333;line-height:30px;font-family:Helvetica,Arial,sans-serif;font-weight:normal;text-align:justify;hyphens:auto" data-flag="normal" lang="en"><b>1. This information has been classified top secret.</b></p><span><br /></span><p style="font-size:16px;color:#333333;line-height:30px;font-family:Helvetica,Arial,sans-serif;font-weight:normal;text-align:justify;hyphens:auto" data-flag="normal" lang="en"><b>这个情报被归类为绝密。</b></p><span><br /></span><span><br /></span><p style="font-size:16px;color:#333333;line-height:30px;font-family:Helvetica,Arial,sans-serif;font-weight:normal;text-align:justify;hyphens:auto" data-flag="normal" lang="en"><b>2. I tried to keep it secret from my family.</b></p><span><br /></span><p style="font-size:1...