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To support secure group communications in resource constrained wireless sensor networks, We propose an efficient and scalable key management scheme which only uses symmetric cryptographic algorithms and hashing function. This scheme can achieve forward and backward security.

为了在有限资源的无线传感器网络能安全进行群组通讯，本文只使用对称加密算法和单向哈希函数提出了一种具有有效性和扩充性的组密钥管理方案，并可满足前向和后向安全性。

The authors also propose several noteworthy problems of how to apply the air-source heat pump hot water unit.

最后对空气源热泵热水机组的应用提出了几个应注意的问题。

An ancient Greek astronomer who was one of the first to propose a heliocentric theory of the universe (ca. 270 BC).

最早提出太阳中心说的古希腊天文学家之一。

Norm is obtained. Fourthly, we propose a new mesh adaptation algorithm based on the Hessian matrix, which is suitable for 2-D 3-T radiation heat conduction equations.

第四，本文从基于Hessian矩阵的网格自适应理论出发，设计了一种适用于二维三温辐射热传导方程的网格自适应算法。

We propose that ORFL3 gene product may have roles in iron transport. Under BG11〓 culture conditions, ML3 also can induce heterocysts, But heterocyst development was a little different, there were many heterocysts at two ends of filaments.

但在铁缺失条件下ML3生长缓慢，光合色素含量低，蛋白质合成慢，表明ORFL3基因产物对在缺铁条件下的生长是必要的。

Because of NP property, we will propose an heuristic algorithm to solve the problem.

由于该问题是NP-完备的，我们给出了一个启发式算法。

Meanwhile, we propose a new heuristic.

同时，在本文中，我们提出了一种新的启发式算法。

Inasmuch, then, as woman shares equally the joys and sorrows of time and eternity, is it not the height of presumption in man to propose to represent her at the ballot box and the throne of grace, to do her voting in the state, her praying in the church, and to assume the position of high priest at the family altar?

既然短暂的时光乃至永久岁月所带来的欢乐和痛苦，男女一样平分，那麼男人想在投票箱前，在王位上代表妇女，想在国家中代妇女投票，在教堂里代妇女祈祷，在家庭里高居圣坛之上，扮演神父角色，这岂不是霸道至极吗？

The main idea is to propose a light festival in high-density cities worldwide in terms of urban installations.

我们的设计概念是'光的节日'：以高密度的大都市为背景，用建筑的语言设计一种装置。

The method propose the space hingeconcept to the traditional element joint hinge,which can account for the effects ofresultant interactions at element end and elastic unloading.

此方法赋予了杆端塑性铰以空间铰的概念，它既考虑了杆端处内力间的相互影响；也计及了弹性卸载的影响。

I had a lovely dog named PiPi, he was one of my best friends.

我曾经有过一只小狗，它的名字叫皮皮，它很善良，它是我最忠实的朋友。

Newly ovulated mouse oocytes were cultured in the CZB medium supplemented with different concentrations of pyruvate before treated for activation or assayed for MPF activity.

我们猜测卵母细胞在不含丙酮酸的条件下老化的更快，并且卵丘细胞可能通过消耗不含葡萄糖的CZB中的丙酮酸从而促进卵母细胞老化。