再循环

Some technical problems arose during the debugging of the accelerator. The ion source did not produce arc. The accelerator tube cracked. The control system was out of order. The transporting capacity of the charge belt degraded. The corresponding reasons were analyzed and some measures were adopted to solve the problems. The drawing voltage was raised to its predetermined position after the ion source produced arc and should be reduced to zero before turning off the accelerator. Transition flange was lathed and the accelerator tube was re-assembled. The control equipment at high voltage was shielded. TVS diodes were installed at the input and output ends.

调试中出现了离子源不起弧、加速管破裂、控制系统失灵和输电带输电能力降低等技术问题，分析了出现这些问题的原因，然后分别采取了相应的措施加以解决：变换工作流程，在每次关机前先把引出电压降为零，开机时等离子源起弧后再把引出电压升到预定值；对过渡法兰进行车加工，重新封装；对高压端的控制设备采取屏蔽措施，在输入、输出端使用TVS二极管，对控制软件进行抗干扰设计；对绝缘气体进行循环干燥等。

PAA/PVA IPN hydrogels were prepared by a sequential method by which acrylic acid firstly. polymerizes and cross-links in PVA/water solution with UV irradiation,then PVA physical cross-linked hydrogels are formed in cross-linked PAA networksby freezing-thawing. The orthogonal test design method was used to optimize theexperimental conditions based on the mechanical and swelling properties of thehydrogels. The effect of the PAA and crosslinking agent contents on the microscopicmorphology of the PAA/PVA IPN xerogel was investigated by transmission electronmicroscopy, and on the mechanical properties of the hydogels was studied bymeasurements of mechanical properties.

针对水凝胶强度、生物相容性和刺激响应性的需要，选择了以PVA和PAA为复合水凝胶的基本分子结构；采用顺序IPN方法制备PAA／PVA IPN水凝胶，即将单体丙烯酸与PVA溶液共混，AA经紫外光辐射聚合交联在PVA溶液中形成PAA化学交联网络，再经冰冻—解冻循环过程在PAA网络内形成PVA物理交联网络。

Water is a naturally circulating resource that is constantly recharged.

水是一种自然循环的资源，它可以不断地再利用。

Isolated use of water can be recycled.

分离出的水可以循环再利用。

METHODS: Saliva and serum samples of 5 infected, 7 reinfected and 8 treated rabbits were collected at different times periods. The CAb in saliva and serum was detected by using ELISA.

建立血吸虫兔感染模型，收集感染后不同时期、再感染及治疗后不同时期的唾液和血清，用ELISA 检测其中的循环抗体及其效价，并将检测结果加以比较。

The cell then replenishes the PrPc,and the cycle continues.

其后细胞在补充 PrPc ，如此循环再继续下去。

Manila , Philippines : A boy scavenges along the polluted shoreline of Manila Bay for recyclable items he can sell John Javellana Reuters

菲律宾马尼拉：一个男孩清理污染马尼拉湾沿海岸线的可循环再用的物品，他可以出售

Currently sequestrating CO2 to agricultural soil is a. front field in soil carbon cycle studies, among which whether agricultural soil redistribution leads to carbon sequestration has developed scientific, political and social interests.

当前，农田土壤固碳过程是土壤碳循环研究中的一个前沿领域，其中农田土壤再分布过程能否导致土壤固碳已引起科学上、政治上以及社会上广泛的兴趣。

The lead paste is then smelted in a blast furnace.

那么它理应成为循环再利用的楷模。

The iron isotopic composition lightly from hydrothermal fluid upwelled into ocean, BIFs are enriched in heavy isotopes of Fe by partial oxidation and precipitation, and iron isotopic composition was homogenous and reequilibrium during different minerals by metamorphism.

提出了地球早期海洋中Fe的循环模式：洋中脊喷发富集Fe轻同位素的二价铁热液流体，流体进入海洋后经过部分氧化和沉淀的过程使得BIF富集Fe的重同位素，后期的变质作用使得不同矿物间发生了Fe的均一化及再平衡

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！