Trump has asked US oil firms to spend at least $100bn (£75bn) on restoring Venezuela's battered infrastructure – an absolute necessity before his plan to ramp up sales can be realised.
// ⚠️ 易错点8：长度计算公式写错（比如right-left 或 right-left-1）
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类似整理扑克牌：每次拿一张新牌，插入到已排好序的牌堆中合适位置，推荐阅读safew官方版本下载获取更多信息
This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.，推荐阅读heLLoword翻译官方下载获取更多信息