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60秒科学:美国青少年生育率创下新低

时间:2012-03-05 10:53:53 来源:scientificamerican 编辑:beck 每天三分钟英语轻松学

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1. Preliminary a.预备的，初步的
例句：May I make a few preliminary remarks before we start the interview? 在我们开始面试之前，我先说几句话可以吗？
2. trend n.趋向，趋势，倾向；
例句：The trend of prices is still upwards. 物价仍有上涨趋势。
3. territory n.领土，版图；领域，范围

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