The knight used a lance to unseat his opponent.

骑士使用长矛将对手击落。

To unseat or throw off, as from a horse.

使下(马);使掉下(马 )

Once firms become technology leaders it is harder unseat them.

一旦公司成为技术的引领人物,想就革除很难了.

As for the jobs in development, lingering intellectual property rights concerns mean that Shanghai is unlikely to unseat Silicon Valley anytime soon.

随着这些工作的发展，存在已久的对于知识产权的担忧意味着上海不可能在不久的未来失去硅谷的宝座。

The last stop of the night was Sioux Falls, South Dakota, where Democratic congressman Tim Johnson had a real chance to unseat incumbent Republican Larry Pressler.

当夜的最后一站是南达科他州的苏福尔斯，在那里，民主党众议员蒂姆·约翰逊真正有一个机会夺取在任共和党众议员拉里·普雷斯勒的席位。