1. America is a developed country, in contrast, Mexico is economically underdeveloped. 美国是一个发达国家，对比之下，墨西哥经济落后。
2. Puny demand was partly the result of small wage rises, but it was also because Germany's service sector is underdeveloped. 萎靡的需求部分是工资上涨幅度微弱的结果，但同时也是德国的服务业发展滞后所造成的。
3. Providing adequate water is especially challenging in drier, underdeveloped and developing nations with large populations, because demand in those areas is high and supply is low. 人口众多且较乾旱的未开发及发展中国家，尤其难以取得足够的用水，因为这些地区的需水量高，但供水量低。
英英解释
adj.
1. relating to societies in which capital needed to industrialize is in short supply
2. not yet fully developed
3. (of a photograph) lacking in contrast because it was left in the developer for less than the require
