| 1. | It was a period of substantial change .
这是一个本质变化的时期。 |
| 2. | It was a period of splendor when civilization took shape .
它是文明在形成中的灿烂时期。 |
| 3. | This is frequently noted clinically as a period of diuresis .
临床上，这常表现为多尿期。 |
| 4. | Bangladesh has passed through a period of critical challenge .
孟加拉经历了一个严峻的考验。 |
| 5. | Then we dried them slowly, over a period of many months .
要慢慢地把它们晾干，我们又得等上几个月。 |
| 6. | Climate is summary of weather conditions over a period of years .
气候是数年中气象条件的综合概况。 |
| 7. | A period of quiet has been succeeded by one of rapid movement .
一段平静无事的时期之后就继之以变动剧烈的时期。 |
| 8. | We now entered upon a period of extreme tension and vigilance .
我们现在进入了一个非常紧张，需要非常警惕的时期。 |
| 9. | For a period of time, the pressure decreases steadily, as in air .
在一段时间之内，就象在空中那样，压力继续下降。 |
| 10. | Penicillin and magnamycin had continued antibacterial activity over a period of 7 days .
青霉素和碳霉素有持续七天的抗菌作用。 |
