The U.S.government says Tehran is trying to make weapons-grade nuclear material.
VOA: standard.2010.06.29
They want to make the tests for the... they get into another grade, a little harder.
他们想通过考试……让孩子们升入下一个年级,并提升一点考试难度。
哈莱姆的变迁 - SpeakingMax英语口语达人
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