有些骑自行车的人携带修理工具，以备万一车胎被扎破。
Some cyclists carry repair outfits in case they have a puncture.
我必须把摄像机放在手边，以备万一碰到需要拍摄的场景时可以立即拍摄。
I had to keep the video camera readily accessible in case I saw something that needed to be filmed.
俄国科学家也在做以备万一的计划。圣彼得堡国家大学的李尔尼德·索科尔夫教授说，阿波菲斯99942更有可能在撞上地球之前就已经被击碎。
The Russian scientists are also hedging their bets. Professor Leonid Sokolov of St. Petersburg State University remarked that 99942 Apophis would most likely disintegrate before hitting Earth.
俄国科学家也在做以备万一的计划。圣彼得堡国家大学的李尔尼德·索科尔夫教授说，阿波菲斯99942更有可能在撞上地球之前就已经被击碎。
The Russian scientists are also hedging their bets. Professor Leonid Sokolov of St. Petersburg State University remarked that 99942 Apophis would most likely disintegrate before hitting Earth.
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