小学级别的单词：day, desk, duck, dear, death, do, date, dog, dislike, dark, dad, daily...
中学级别的单词：dwell, donate, devil, delight, debug, difficult, different, distinguish, due, dabble, descend, distribution, deny, dormant, delay, destination...
大学级别的词：differentiate, dacron, doom, dummy, discretion, discerment, disconcert...
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