| 1. | Booms run in cycle .
景气状况周期性地出现。 |
| 2. | The state of knowledge in this field has been surveyed periodically in review papers .
在一些评论文中对这一领域的动态周期性地进行了评述。 |
| 3. | A canister purge valve is opened periodically to vent the vapor back into induction system .
收集器的清除阀周期性地开启，泄放蒸气使之返回进气系统。 |
| 4. | Economic dislocations such as "the panic of 1837" occurred periodically during the 19th century .
十九世纪曾周期性地发生象“一八三七年恐慌”那样的经济失调现象。 |
| 5. | Periodically, the lamellae become enlarged, forming flattened, membrane-enclosed vesicles called thylakoids .
片层周期性地扩展，形成扁平的有膜为界的囊，称为类囊体。 |
| 6. | Dead mappings could be eliminated by periodically scanning the
可以通过周期性地扫描 |
| 7. | The script can be called periodically from a
中周期性地调用这个脚本。 |
| 8. | Keys should periodically be changed
密钥应该周期性地更改。 |
| 9. | I get blue or depressed regularly
我周期性地感到抑郁。 |
| 10. | Military revolutions have occurred periodically for centuries
许多世纪以来军事革命一直在周期性地发生。 |
