| 单词 | 有效用 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔cross-tolerance〕Resistance to the effects of a substance as a result of continued exposure to a different substance having a similar pharmacologic action.交叉耐药性：通过接触另一种具有相似药理作用的不同物质而产生的对某一物质有效用的耐性美国传统Some people think this system of education has outlived its usefulness (= is no longer useful).一些人认为这一教育制度已经不在有效用了。剑桥国际The proposed reforms have forced people to think of the constitution as a working document, not a ceremonial irrelevance.建议的改革迫使人们把宪法看作有效用的文件，而不是礼仪场合的无关紧要事物。剑桥国际 |
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