alterative造句

例句与造句

1. Some measures of spam filtering , such as black or white list , manual rules and so on have been widely used . but it is difficult to maintain the rules because the features of spam are alterative , and the rules - based filtering is not satisfactory in practice . so these measures have certain limitations
   近年来,有关垃圾邮件过滤技术的研究逐渐兴起,常见的过滤方法有黑/白名单技术、规则过滤等,但由于垃圾邮件的特征在不断地变化,规则难以维护、准确率不高等原因,这些方法都具有一定的局限性。
2. It's difficult to find alterative in a sentence. 用alterative造句挺难的
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