simpli Safe was singled out in one recent article on jamming, complete with a video showing the entire system being effectively bypassed with hand-held jamming equipment.
2016年12月四級真題(第一套)閱讀 Section B
柯林斯高階英漢雙解學習詞典釋義
ADJ
單個的;單一的;唯一的
You use single to emphasize that you are referring to one thing, and no more than one thing.