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1.underscore v.强调(to emphasize, to stress)
词根记忆：under(在…下)+score(划线)--在…之下划线--强调
例：The mayor underscored the need for more police officers.
2.undertake v.采取(to attempt, to set about)；接受(to accept as responsibility)
例：The study urged states to undertake remedies to reverse a decline in the shark population.//Owners of farms will probably not undertake the expense of cutting down the trees.
派生词：undertaking(n．事业)
3.underwrite v.承诺支付(to agree to pay)；给…保险(to guarantee financial support of)
例：They are not granted governmental subsidies to assist in underwriting the cost of economic development.
4.underwriter n．保险公司，保险业者(insurer)；担保人(guarantor)
词根记忆：来自underwrite(v.给…保险)
例：Life insurance in England remained until the end of the seventeenth century a specialized contract between individual underwriters and their clients.
5.undesirable a．令人不悦的，讨厌的(not desirable; unwanted)
词根记忆：un(不)+desirable(合意的)--不合意的--令人不悦的
例：The second is presented by the argument as one likely consequence that is undesirable.
6.undeterred a．未受阻的( not deterred or discouraged)
例：The new airboat traveled at high speeds undeterred by sandbars.
7.undue a.过度的，不适当的(excessive)
词根记忆：un(表否定)+due(适当的)--不适当的
例：undue concern过度关心
8.unearth v.出土(to dig up out of the earth)
词根记忆：un（打开）+earth（土地）--从地下弄出来--发掘或挖出某物
例：Archaeologists unearthed some 4.500 year-old stone agricultural implements in the historical site.
9.unequalled a．无与伦比的(radically distinctive and without equal);不等同的(not equalled)
词根记忆：un（否）+equalled{相同的）--无与伦比的
例：Even without the aid of telephoto lenses, the visitor to Tanzania's Lake Manyara Park has an unequalled opportunity to photograph lions playing in trees.
adj. 独特的
