奥克金让她再走一次，确保照片拍了下来。
Ms. Orkin asked her to walk down the street again, to be sure she had the shot.
使用在线服务创建你的数码照片副本算是一种“无痛”方法，不管你的电脑遭遇了什么，都能确保照片总在这儿。
Creating copies of your digital photos on an online service is a painless way to ensure they'll be around no matter what happens to your PC.
摄影活性测试能确保封套不与您的照片发生化学反应。
This test ensures that the enclosure will not react chemically with your photos.
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