The sudden appearance of a security guard caused them to drop the money and run.

保安人员突然出现，他们丢下钱就跑了。

《牛津词典》

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The computer and Internet technology are changing the appearance of the human society; it is the question of information and online security with its one that followed.

计算机和互联网技术正在改变着人类社会的面貌，与之伴随而来的是信息和网络安全的问题。

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Given his stocky appearance and hairstyle in the security-video footage, Mr. Burkhart was nicknamed "Meatloaf Seagal" by users of the microblogging site Twitter, a reference to the singer Meat Loaf and action-movie actor Steven Seagal.

WSJ: Police Make Arrest in Los Angeles Fires

She insisted that "people were trying in real time to get to the best information, " and that her focus was on looking ahead on how to improve security rather than revisiting the talking points and Rice's television appearance.

NPR: Feisty Clinton: US Strengthening Embassy Security

Oren has repeatedly praised Obama for his supposedly firm support for Israel and commitment to Israel's security - most recently in an appearance on Fox News on Wednesday.

CENTERFORSECURITYPOLICY: Netanyahu, Obama's newest prop