前后向的

Around 1980s reform and open policy, is the Chinese tradition social lifestyle the transition time which inundates to the modernization.

20世纪80年代改革开放前后，是中国传统的社会生活方式向现代化迈进的转折时期。

Würgler added that, 'because of these ultimatums made by the two FIFA presidents , it was made economically impossible for the ISL Group to move away from the system of commission payments .

Würgler又说道：由于国际足联的前后两任主席都向我们提出了这种最后通牒，因此ISL集团在经济上无法摆脱这种支付佣金的游戏规则。

Würgler added that, 'because of these ultimatums made by the two FIFA presidents, it was made economically impossible for the ISL Group to move away from the system of commission payments.

沃格勒又说道：由于国际足联的前后两任主席都向我们提出了这种最后通牒，因此ISL集团在经济上无法摆脱这种支付佣金的游戏规则。

Würgler added that, 'because of these ultimatums made by the two FIFA presidents, it was made economically impossible for the ISL Group to move away from the system of commission payments.

维尔格勒又说道：由于国际足联的前后两任主席都向我们提出了这种最后通牒，因此ISL集团在经济上无法摆脱这种支付佣金的游戏规则。

A front-back seal ring structure is adopted in the pump to prevent the liquid from leaking from the high-pressure area to the low-pressure area. The front seal ring is mounted on the pump body while the back seal ring mounted on the bearing body. They should be changed when they are so worn-out that they have an effect on the efficiency and self-priming performance of the pump after the operation for a long time.

泵内部防止液体由高压区向低压区泄漏的密封机构是前后密封环，前密封环装在泵体上，后密封环装在轴承体上，当泵经长期运转密封环磨损到一定程度，并影响到泵的效率和自吸性能时，应给予更换。

A front-back seal ring structure is adopted in the pump to prevent the liquid from leaking from the high-pressure area to the low-pressure area. The front seal ring is mounted on the pump body while the back seal ring mounted on the bearing body. They should be changed when they are so worn-out that they have an effect on the efficiencyself-priming performance of the pump after the operation for a long time.

泵内部防止液体由高压区向低压区泄漏的密封机构是前后密封环，前密封环装在泵体上，后密封环装在轴承体上，当泵经长期运转密封环磨损到一定程度，并影响到泵的效率和自吸性能时，应给予更换。

Pennal, a Canadian surgeon, developed an interest in the management of pelvic fractures and investigated the effect of antero-posterior compression, lateral compression and vertical shear forces on the pelvic ring.

Pennal对骨盆骨折的治疗产生了兴趣，并就前后压缩、侧向挤压以及垂直剪切力对骨盆环的效用进行了观察。

Through the demonstrative investigation on students' stratum changes around the foundation of the People' s Republic of China by Xiamen University, exploration has been made on the influence of university entrance examination system on the upward flowing of stratum.

通过对厦门大学在新中国成立前后学生社会阶层变动的实证调查，探究高考制度对社会阶层上向流动的影响力。

Methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling ProTaper rotary instruments using step-down technique,and by K files using step-back technique for control.All teeth were obturated with lateral condensation methods.The efficiency of preparation was analyzed with ra-diographs before and after operation.

选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用ProTaper多锥度镍钛旋转器械逐步伸入法预备根管，对照组用K锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗前后的X线片，评价后牙根管预备效果。

Actually, more than a year ago, the computer had discovered a base of drifters in Europe and the Rocky Mountains. They had been launching super-sized, manned rockets to Mars, for a total of 16 times.

其实，早在一年多前，电脑就发现在欧洲及洛矶山一些游离人士的基地，不断向火星发射超大型的载人火箭，前后有十六次之多。

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。