| 1. | Normal cells show a finite life span .
正常细胞显示有限的生命期。 |
| 2. | Her life spanned almost the whole of the 19th century .
她的一生几乎跨越了整个19世纪。 |
| 3. | Let us consider the development of intelligence across the life span as a substantive example .
让我们把智力的终身发展看作一个实际例子。 |
| 4. | In marsupials, such as opossum and kangaroo, the life span of the corpus luteum is similar in pregnant and nonpregnant females .
在有袋目动物中，如负鼠和袋鼠，妊娠和非妊娠母兽的黄体存在时间相似。 |
| 5. | The trees reach maximum yields at a relatively early age and maintain this level of production throughout their life span .
还在树龄相当小的时候，就可达到最高产量，而且在整个生命周期的，都能保持这种产量水平。 |
| 6. | Life span of the classical solutions to wave equation
波动方程经典解的生命区间 |
| 7. | Defend the baldheaded life span of design , extension
防尘设计，延长光头寿命 |
| 8. | Calculating life span of type 70000c bearings through cai
型轴承寿命的计算机辅助计算 |
| 9. | Narwhals maximum life span is about 50 years
（寿命：独角鲸的最大寿命大约为50年。 ） |
