一次

For every step of arbitrary m-th order finite element methods of nonlinear Hamiltonian systems are first proved high accuracy conservate their symplectic structure, through construct a new auxiliary equation and negative norm estimated of error.

对非线性Hamilton系统的任意m次有限元法，构造了新的辅助问题，并得到误差估计和负范数估计，首次证明m次有限元对每一次步进是高精度Oh~(2m+1意义下近似保辛的。

Firstly, the average line of the acceleration is fitted by cubic polynomial. Then, the long period baseline waving problem, which is still existed in the integral velocity and displacement after the first optimization, is secondly optimized by the recursive method of SDOF system.

首先以3次多项式来拟合加速度的均值线；再对一次优化后的积分速度、位移时程仍存在的长周期基线波动问题，运用单自由度地震动力反应递归法进行二次优化。

Kindergarten teacher, said: a fine three bed-wetting, the second five yuan, three times seven dollars.

幼儿园老师说：尿床一次罚三元，二次五元，三次七元。

The Duke of Medina Sidonia now sent a message to the Duke of Parma in Dunkirk:"I am anchored here two leagues from Calais with the enemy's fleet on my flank. They can cannonade me whenever they like, and I shall be unable to do them much harm in return." He asked Parma to send fifty ships to help him break out of Calais. Parma was unable to help as he had less than twenty ships and most of those were not yet ready to sail.That night Medina Sidonia sent out a warning to his captains that he expected a fire-ship attack. This tactic had been successfully used by Francis Drake in Cadiz in 1587 and the fresh breeze blowing steadily from the English fleet towards Calais, meant the conditions were ideal for such an attack. He warned his captains not to panic and not to head out to the open sea. Medina Sidonia confidently told them that his patrol boats would be able to protect them from any fire-ship attack that took place.Medina Sidonia had rightly calculated what would happen.

1577年，他再次从英国出发，乘着旗舰"金鹿"号直奔美洲沿岸，一路打劫西班牙商船，西班牙人做梦也想不到，竟然有人敢在"自家后院胡闹"，当他们派出军舰追击时，德雷克早已逃往南方，但由于西班牙的封锁，他无法通过狭窄的麦哲伦海峡，在一次猛烈的风暴中，"金鹿"号同船队其它伙伴失散了，被向南吹了5°之多，来到了西班牙人也未曾到过的地方，自从麦哲伦海峡被发现以来人们一直认为海峡以南的火地岛就是传说中的南方大陆的一部分，但此时呈现在德雷克面前的是一片汪洋大海，德雷克被这意外的发现惊呆了，他很高兴的向大家宣布"传说中的南方大陆是不存在的，即使存在，也一定是在南方更寒冷的地方，"(直到今天我们还称这片广阔的水域为"德雷克海峡")，但德雷克却一直向西横渡了太平洋。1579年7月23日，他到达了马里亚纳群岛，8月22日穿过北回归线，9月26日回到了阔别已久的普次茅斯港，再次成为了"民众的英雄"，这次航行是继麦哲伦之后的第二次环球航行，但德雷克却是第一个自始至终指挥环球航行的船长(众所周知，麦哲伦在菲律宾被土人做成三明治吃掉了)。

All you have to do is dunk in the chilling water one ,two, three times.

你所要做的就是在冰冷刺骨的水中浸入一次，两次，三次。

All you have to do is dunk in the chilly water one, two, three times.

每个人需要做的就是在寒冷的水中浸洗一次，两次，三次。

They are ①cubic plane curve constituted with projective pencil of lines and line eonic

进而证明三个定理：①一次线束和其射影对应的二次线束，所对应直线交点的轨迹为三次平面曲线

Koblitz curves over a finite field of characteristic 2 and characteristic 3 disassembles k using prime element of simple Euclidean domain.To further improve the efficiency,presents an assumption of disassembling k based on prime element of quadratic Euclidean domain.

特征2和特征3的这类Koblitz曲线是以一次欧式环的素元来分解k，对此设想是否可以二次欧式环的素元为基底来二次分解k从而进一步提高效率。

I have not seen a rash of exanthema not out of a second book, from the children seems to indicate that the two are exanthema measles, as both are back from burning rash, which is measles exanthema the most special place.

我没有看到过有关幼儿急疹出了一次就不出第二次的书籍，从孩子的现象来看，两次都是幼儿急疹，因为都是烧退后起疹子，这是幼儿急疹最特殊的地方。

Lang had warned Rick about Edwards during one of the last links the Farrago had had with Base Tirol, and it was difficult to keep the memory of that brief deep-space commo from surfacing.

在法拉戈号同泰洛基地的最后几次通信中的某一次里，朗早就警告过瑞克关于爱德华兹的问题，那次短暂太空通话的回忆此刻涌现出来，难以抑制。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。