| 1. | The components of a potassium cycle vary greatly .
钾素循环的各个环节有很大的变化。 |
| 2. | That is the minimum number necessary to complete the circuit .
这是完善循环的最低限度人数。 |
| 3. | Man's effect on the sulfur cycle has been considerable .
人类对硫循环的影响一直是很可观的。 |
| 4. | The far-traveling water molecules may have participated in countless phase of the water cycle .
远道而来的水分子可能已参与了水循环的无数阶段。 |
| 5. | As we have already noted, the movement of water into the ground is part of the hydrologic cycle .
我们已经说过，水向地下运动是水文循环的一部分。 |
| 6. | Thus the economy would have completed the first round of an upward spiral of accelerating growth .
这样，经济就完成了加速增长并向上循环的第一轮。 |
| 7. | It was less than two years after the principle of solid circulation was confirmed in the large-scale pilot plant .
这距固体循环的原理在大型试验装置中得到确认不到两年。 |
| 8. | In the spark-ignition engine, recirculating some of the exhaust gas reduces the emission of nitrogen oxides .
在火花点火的发动机中，再循环的一部分废气减少了氧化氮的有害污染。 |
| 9. | While a numbher of stirred-tank designs involving either internal or external recirculation of the reaction mixture have evolved in recent years .
同时，最近几年开发了一系列使反应混合物进行内循环或外循环的搅拌槽式装置。 |
| 10. | Birth and death are all part of the same cycle
生和死都是同一个循环的一部份。 |
