短语讲解：

1. In his confirmation hearing, U.S. Senators asked the former head of Exxon-Mobil how to prevent U.S. assistance from being stolen by corrupt foreign countries.

prevent from 阻止， 防止
例句：Active cure of swoon patients was important to prevent from complications.
积极救治晕厥患者，对预防并发症有重要意义。

2. "Too much of the foreign aid given by the Western countries -- U.S., OECD countries -- has ended up only securing in power corrupt regimes."

end up（以…）结束; 最终成为[变得]; 最后处于
例句：If we do, we will end up with nothing.
否则，我们到头来什么也得不到。
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