题目内容
n. a period of time, usually in history, that is different from other periods because of particular characteristics or events
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adj. easily able or likely to explode; n. a substance that is able or likely to cause an explosion
n. a natural or synthetic mixture that contains nutrients that is added to soil to boost plant growth
adj. connected with or located on the outside of sth./sb.;
n. a strong feeling of excitement and interest in sth. and a desire to become involved in it
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