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But this kind of open emission and reception system in High frequency communication has to face two challenges: firstly, natural interference from atmospherics and industry; secondly, tracing, blocking and multipath interference from enemy.

但这种开放式的发射和接收电磁波的通信,特别是在短波通信领域,不仅易遭到天电、工业等自然干扰,而且还要遇到敌方人为的跟踪、阻塞干扰以及多径等各种干扰。

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According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm~150rpm时取得最大值,此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世,形体几无变化。

When I was in school, the rabbi explained everythingin the Bible two different ways.

当我上学的时候,老师解释《圣经》用两种不同的方法。