有效时间

Time of payment:by 100% confirmed irrevocable letter of credit in favor of the sellers to be available by sight draft to be opened and to reach china before may 1, 2004 and vto remain valid for negotiation in china until th e 15th days fafter the foresaid time of shipment

100%以卖方为受益人开立的保兑不可撤消即期信用证，信用证于2004.05.01前开立并送到中国。信用证在中国有效，并保持有效至前面所说的发运时间后15天。-----这样翻译似乎更好些吧？

To develop the most efficient system the golfer needs to understand how to most efficiently use their time.

为了发展最有效的系统的球员需要了解如何最有效地利用时间。

The average depth of erosion on gritstone for cavitation water jets is 2 times as much as common water jets, and its mass erosion is 7 times as much as common water jets, and its diameter of erosion is 2.3 times as much as common water jets.

对于含有空泡的磨料射流，围压增加空化噪音减少，泵压增加空化噪音增加；有效靶距直径比增加，对花岗岩的冲蚀深度与冲蚀质量存在一最优有效靶距直径比；在最佳冲蚀时间下，较纯水空化射流工作效率提高2倍。

The simulation outcome demonstrates that various control measures after April 20,2003 in Beijing and the public holidays starting from May lst to May 5th have a significant impact on containing the epidemic situation. The most dangerous days, around April 27, when the number of uncontrolled SARS patients in the society reached at its peak, can also be calculated. The SARS infectiousness number newly reported in Beijing has been at a low level since May 20. But simulation experiments describe that it may fluctuate with import of SARS infectiousness from outside Beijing, weakening of quarantine, more social activities, and so on.

同时应用动力学模型，对北京的SARS疫情进行分时间段的模拟与SARS实施控制因素影响分析，结果表明，2003—04—20以后一段时间内实行的各种控制措施，以及5月1日—5月5日的长假对于北京SARS疫情的控制是非常有效的；而4月27日左右北京市社会上未得到有效控制的SARS病人数达到高峰，是最危险的时期。5月20日以后，北京的SARS疫情基本保持在低发的平台期，但是如出现较多的外来SARS病例输入，而内部隔离强度又减弱、社交活动增加等情况下，北京SARS疫情可能会有一定程度的波动与反弹。

Nepetalactone, the primary component of catnip oil, were extracted by the using method of simultaneous distillation-extraction and separated by using silica gel chromatography column. To compare the repellency of nepetalactone and DEET on mosquitoes, topical bioassay method on the skin and a cage olfactometer were employed to assess the effective protection time and the spatial repellency.

采用同时蒸馏萃取及硅胶柱层析法从猫薄荷Nepeta cataria植物中提取、分离制得驱蚊有效成分假荆芥内酯，并采用个体涂肤有效保护时间测定法及风洞空间驱避效果测试法，对假荆芥内酯与避蚊胺的驱蚊效果进行了对比试验。

objective:to evaluate junction rhythm and atria pacemaking to show pathway conduction block as successful ablation indicatives applied in avnrt of slow pathway ablation and compare the difference of discharge time and ablation targets to ablation endpoint. methods:153 patients with avnrt were performed slow pathway radiofrequency ablation.

目的：评价以出现交界性心律与心房起搏显示慢径前传导阻滞作为有效消融指标在房室结折返性心动速慢径消融中应用，比较这两种有效消融指标判断方法在慢径消融达到消融终点时的放电时间与消融靶点数的差异性。

The Ca/Porg of CPP1 produced by hydrolyzing casein with pancreatin, decreased to 0.74 and 0.53 respectively when temperature increased to 30 and 35℃.

浓度达200ppm时，CPP1可使溶液中的钙在1小时的反应时间内几乎不沉淀。升高温度到35℃后，CPP1的最低有效浓度增加为25ppm。在35℃，Ca：P增为2：1时，CPP1的最低有效浓度增加至100ppm。

Parathyroidectomy remains the only definitive therapy for this disease. The development of minimally invasive radioguided parathyroidectomy has enabled a quick and safe approach to this therapy.

在治疗方面，副甲状腺切除手术是目前唯一能有效根治的方法，其中微创放射导引副甲状腺切除手术(Minimally invasive radioguided parathy-roidectomy)的发展则可有效缩短手术时间及其并发症。

The dissertation includes the work as follows: Firstly, we present a random graph model with spatial reuse for a dense MANET which using directional antennas. The analytic formula of several important performance parameters for the MANET are obtained under the DSR routing protocol, such as the average flooding distance, the probability generating function of the flooding distance, the probability of a flooding route to be symmetrically valid, the average time to find a symmetrically valid route and the cost to successfully route a data packet to its destination. We compare the two models with spatial reuse and without spatial reuse by evaluating these parameters. It is shown that the spatial reuse model is much more effcctive in terms of the performance of the dense network with directional antenna, because the bigger is the degree of spatial reuse, the smaller is the average flooding distance.

在定向天线技术的支持下，建立了移动自组网络空间可重用的贝努利随机图模型，获得了DSR路由协议下平均泛洪距离的解析公式和泛洪距离的概率母函数：给出了有效对称路由概率、发现有效路由平均时间、成功路由代价等关键性能参数的解析分析；在网络性能参数定量分析的基础上，对空间可重用和无重用的网络进行了比较分析，结果显示空间重用度增大，则平均泛洪距离、路由发现时延、网络代价减少。

A questionnaire survey was carried on among the Hangzhou private vehicle owners by quota sampling, in addition to individual interviews.

在两个月时间内共发放问卷700份，其中有效回收问卷为296份，有效回收率为42.3％。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。