一个 巨难 解释的英语句子 -----务必高手帮忙
“Earthquake!” The word flashed in my brain.A roaring sound filled my ears.I tried to slidebeneath my desk.The desk did a wild tap dance,slipping and sliding towards the center of the room.I twisted my body and grabbed at the windowsill behind me,somehow kicking free of my dancing chair.I tried to stand.【My legs staked away as if on a bucking escalator（自动扶梯）】.
为了方便大家的理解,我给出了原文.
1、解释【】里的两个单词：staked和bucking在句中的意思
2、stake away是短语吗?on a bucking escalator如何翻译?