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讲解文本： concrete 具体的，混凝土的 We still don't have a concrete timeline for the plan. 关于这个计划，我们还没有具体的时间表。 I can't tell you anything concrete. 我也不能跟你说得太具体。 疯狂练习吧！

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今天要学的词组是cast ballot。Cast ballot就是投票。美国是多种族的国家，有的政客以为 voters can be counted on to cast ballots along racial lines -- 他们以为选民们肯定会按照种族的界限来投票。结果呢？