| 1. | Their productive cycle covers several decades .
它们的生产周期可延续几十年。 |
| 2. | The empress dowager of the qing dynasty attended to state affairs for several decades .
清朝慈禧太后垂帘听政几十年。 |
| 3. | It usually takes several decades for atherosclerosis to reach an advanced stage .
动脉粥样硬化一般要经几十年才发展到晚期。 |
| 4. | For several decades thereafter control of infectious disease was based exclusively on the use of antisera and vaccines .
此后几十年间，传染病几乎全靠抗血清及疫苗来控制。 |
| 5. | Agitation for effective public control of railroad rates and services antedated the progressive movement by several decades .
争取有效控制铁路运价和服务的鼓动工作，早在进步运动之前几十年就已开始。 |
| 6. | Several decades have elapsed since i graduated from the college
我大学毕业已数十年了。 |
| 7. | This course has taken several decades in developed countries
完成了发达国家要化几十年才能完成的历程。 |
| 8. | Through past several decades , the ocr technology has improved rapidly
经过几十年的发展，汉字识别技术已经取得了巨大的发展。 |
| 9. | It is therefore predicted that the goal will be fulfilled several decades later
因此预测，这一目标需要几十年的时间才能达成。 |
| 10. | 2 several decades ago , early childhood was spent playing games on the streets
几年前，人们听到某某大学生在打工，常会觉得有点惊奇。 |
