知识扩展
词根词缀 词根 null= none 没有, 无 annul v. 取消 an 加强 + nul〔= null〕没有，无 → 变没有 → 取消 null adj. 无效的；等于零的 nullification n. 无效；废弃 null 没有，无 + ification 形成… → 无效；废弃 nullify v. 取消；废除 null 没有，无 + ify 使… → 取消；废除

中文词源： nullify 使废除，使无效 来自拉丁语nullus,无，没有，词源同no,-fy,使。引申词义使废除，使无效。 nullify
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常见考点例句：

These could nullify efforts by farmers to increase planting areas in response to the highest prices since the 2007-08 food crisis .

作为对农产品价格触及2007-08年粮食危机以来最高水平的回应，农民纷纷扩大了种植面积，而糟糕的天气状况可能会抵消这些努力。

So little electricity do these panels produce under its cloudy northern skies that the emissions from a single large coal-fired power station are enough to nullify all the benefits that their carbon-free contribution might bring .

在多云的北部天空下，这些太阳能板产生的电力极少，结果一个大型燃煤发电站排放的气体就足以抵消这些无碳事业可能带来的所有利益。

But he doesn 't want to do so in the u.s. because assuming a new job or even changing titles within his own company would nullify his existing green card application .

但他不愿在美国做，因为，换了新工作、甚至在原公司职位变了都会取消其现有绿卡申请。

In march , the ministry of finance moved to nullify the guarantees local governments provided for loans taken by their lgivs recognising that in some cases , the guarantees were the only creditworthy assets the vehicles had .

今年3月，中国财政部采取行动，取消地方政府为其融资平台提供的贷款担保该机构认识到，在某些情况下，此类担保是地方融资平台唯一信用可靠的资产。

The kremlin has given mixed signals about how far it will seek to nullify these accords , and how much these moves have been caused by the missile-defence row .

有关其在试图废弃这些协定的问题上会走多远，以及因导弹防御问题的争吵所招致的这些举动进行了多少，克里姆林宫已经发出了复合信号。