在传播中

A'.'' gas in an applied electric field.

电在电场中的气体中传播的现象。

Through a gas in an applied electric field.

电在电场中的气体中传播的现象。

3D effect is analyzed and the average velocity of wave propagating in the pile, which mainly influences inverse interpretation, is discussed. Finally, the theory results are verified by model experiment. It is shown that 3D results have the same phase with ID results. The pile radius, the duration of impulse, the ratio of hammer radius to pile radius and shear velocity of the soil around the pile have influences on 3D effect. The best position of receiver is 0.55R from the pile center. The average velocity of wave propagating in the pile reduces due to transversal inertia effect and 3D effect.

结果表明：三维曲线与一维结果在相位特征上一致；波场图直观地反映了波在桩中的传播规律；三维效应与桩径、激振脉冲宽度、相对激振半径及桩周土剪切波速有关；传感器放在0.55R处可以得到干扰较小的信号；三维效应和横向惯性效应的存在会使桩中的波速减小，土的性质对波速影响不大；反演精度与缺陷的性质、激振条件有关。

4The low similarities betweenseed banks and the established vegetation were considered to be the consequences ofthe frequent presence in the established vegetation but not in seed banks of someperennial rhizomatous plants which mainly depended on vegetative propagation toregenerate;insignificant difference in the species composition of seed barks amongtransects, might be accounted for by the fact that the flood drift had functioned as adisseminator for propagules;and with the intensifying of the flooding disturbance,both species diversity and the similarity between seed banks and establishedvegetations declined.

4种子库与地上植被相似性普遍较低，其原因是主要靠营养繁殖以更新种群的多年生根茎植物经常在植被中出现而不在种子库中出现；受水淹干扰的样带之间种子库的种类组成差异不大，说明洪水漂移行使了繁殖体传播和散布的功能；随水淹干扰强度增加，种子库物种多样性指数减小，种子库与地上植被的物种组成相似性下降。

On Friday, officials there announced plans to ban city residents from keeping free-roaming backyard poultry, in a bid to prevent the virus spreading to people.

周五，当地官员公布了禁止城市居民在庭院中饲养家禽的计划，以防止病毒在人群中传播。

Methods PCR screening and DNA sequence were used to determine the drug resistance genes associated with class I integron in 4 clinical strains of P.aeruginosa. The resistance genes were located by conjugated transfer experiments and the conjugations were studied by PCR method.

整合子通过整合酶从环境中捕获耐药基因盒，并将耐药基因盒组装在一起，形成巨大的耐药基因多基因座；同时整合子及耐药基因盒可借助转化、转导及接合等方式在细菌中转移，使耐药基因广泛传播。

Instead, he argued, light waves can travel in vacuo without being supported by any material—unlike sound waves, which are vibrations of the medium in which they propagate.

他主张，光波可以在真空中行进，并不需要任何物质来支撑，不像在介质中传播的声波，其实只是介质的振动而已。

The three-dimensional finite element model of guided wave in the pipe was built by the finite element method.

利用有限元方法建立管道导波3-D模型，通过在管道中激励纵向超声波，模拟导波在管道中的传播形态。

The mode simulated the propagation of guided wave in a pipe by applying the longitudinal ultrasonic to the pipe end.

利用有限元方法建立管道导波3-D模型，通过在管道中激励纵向超声波，模拟导波在管道中的传播形态。

A special Tasmanian devil-dedicated laboratory has been set up in the northern town of Launceston, where scientists are desperately trying to work out what causes the disease and how it is transmitted.

斯科特说，在动物界中，以前惟一有过记载的一次是一种通过交配传播的犬类恶性肿瘤，而这也是他们在研究工作中所涉及到的惟一一种疾病。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。