1. There is no emergency back-up immediately available. 没有立即就能获得的后备。
2. As a result, they have lost the parachute they once had in times of financial setback—a back-up earner (usually Mom) who could go into the workforce if the primary earner got laid off or fell sick. 因此,它们已经失去了在经济萧条时期曾经持有的“保护伞”——一个后备挣钱者(通常是母亲),她可以在主要挣钱者失业或者病倒的时候出去工作。
3. Think about a possible back-up plan. 想好一个可能的后备计划。
4. Homes lacked back-up power generators. 家里也没有备用的发电机。
5. You can back up another two feet or so. 你可以再退两英尺左右。