在传播中

We cannot see sound waves as they travel through...

声波在空气中传播时，是看不见的。。。

We cannot see sound and waves as they travel through air .

声波在空气中传播时是看不见的。

Which one of the following statements is True of the speed of light in materials?

关于光在物质中的传播速度，下列哪个陈述是正确的？

In this paper, the modes of transmission of Streptococcus mutans in people are summarized.

本文对变形链球菌在人群中的传播方式作一综述。

Objective To investigate the clinical significance of hepatitis B virus transcripts in transmitting from mother to infant.

目的 探讨乙型肝炎病毒转录体的检测在母婴传播中的意义。

The dynamical properties of frozen soil model are related to propagation velocity of Ultrasonic wave in frozen soil.

冻土模型的动力学性质同超声波在冻土中的传播速度有关。

The wave front of the ultrasonic wave can be changed by using the sound lens.

目前 ，增大超声波在岩层中传播距离的方法是增大超声换能器的功率。

The propagation of stress waves in solids can be considered as a part of the field of acoustics or ultrasonics depending on the conditions.

应力波在固体中的传播，根据其条件可视为声场或超声场的一部分。

Political authority's role lies in the dissemination of moral ideas, which is of fatal importance for the universal validity of morality.

而政治权威在道德观念的传播中起着重要的作用，这是道德实现其普遍效力的另一重要环节。

Experiment has shown that the velocity of sound in air is the same in all directions, if there is no wind and the air is at rest in the chosen c.s.

实验表明，如果没有风，空气是静止的（对于我们所选择的坐标系来说），那么声音在空气中向各个方向的传播速度都是一样的。

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。