考研英语复习过程中，一些又长又难的词汇总是让同学们头疼。海天考研小编整理了一些常考的长难词，希望对大家有所帮助。

approximately、ad.近似地，大约

[真题例句] During several years of gambling in that casino ,Williams, a state auditor earning $35,000 a year ,lost approximately $175,000.[2006年新题型]

[例句精译] 威廉姆斯是一名州审计师，每年挣35000美元，但是在娱乐场的几年赌博中，大约输掉了175000美元。

antibacterial、a.抗菌的;n.抗菌药

[真题例句] He experimented with antibacterial substances for nine years before he made his discovery.[1994年阅读5]

[例句精译] 他(亚历山大·弗莱明爵士)是对抗菌物质进行了长达9年的实验才有了这项发明。

alternatively、ad.作为选择，二者择一地

[真题例句] If you are talking to a group of managers, you may refer to the disorganized methods of their secretaries; alternatively if you are addressing secretaries, you may want to comment on their disorganized bosses.[2002年阅读1]

[例句精译] 如果你在和一群经理谈话，你就可以评论他们秘书的工作方法紊乱;相反，如果你在和一群秘书谈话，你就可以评论他们老板的工作方法紊乱。

advertisement、n.广告，做广告

[真题例句] It lowers the costs of many services: without advertisements your daily newspaper would cost four times as much, the price of your television licence would need to be doubled, and travel by bus or tube would cost 20 per cent more.[1995年阅读1]

[例句精译] 它(广告)降低了多种服务费用，没有广告，每天看的报纸价格会上涨四倍，电视收视费会翻番，公共汽车或地铁票也得提高20%以上。