學個詞 Learn A Word: 3205 leapfrog 跳升，越級

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leapfrog 原指兒童玩的青蛙跳游戲，引申下來就是跳升，越級。

The U.S. government said it was working to "harden" the border crossing at Tijuana, Mexico, to prepare for the arrival of a migrant caravan leapfrogging its way across western Mexico. 美國政府表示，正在努力“加強”位于墨西哥蒂華納的過境點，準備應(yīng)對越過墨西哥西部的移民大軍到來。

The U.S. is on pace to leapfrog both Saudi Arabia and Russia to become the world's biggest oil producer. 美國正在逐步超越沙特阿拉伯和俄羅斯，成為世界上最大的石油生產(chǎn)國。

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