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1. The cot opener is a small tool that can be used to adjust the mattress on a bed.
床垫开缝器是一种小型工具，可以用来调整床上的床垫。
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2. The cot opener helps to keep the mattress in good condition by preventing it from getting too flat or lumpy.
床垫开缝器通过防止床垫过于扁平或凸起，帮助保持床垫的良好状态。
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3. After using the cot opener, the mattress feels more comfortable and supportive for the child's sleep.
使用床垫开缝器后，床垫对孩子的睡眠感觉更舒适、更有支撑力。