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The results show that all the hmgr genes from pigs, cattle and chickens are astable enzyme proteins with the same gene sequence characteristics and encoding protein and physical and chemical properties; all the amino acid sequences have a high degree of homology, containing two conservative HMG-CoA binding motifs and two NADPH binding motifs; all the amino acid sequences, containing signal peptide, are secreted proteins; they are all hydrophobic transmembrane proteins with five transmembrane domains; random coil and α-helix are the main structural elements in the HMGR polypeptide chain; all the predictions of three-dimensional structure are V- shaped; there are more closer evolution relationship between the HMGR gene from pigs and cattle.

结果表明：猪、牛和鸡HMGR基因序列特点及编码蛋白质理化性质基本相同，均属不稳定类酶蛋白；保守结构域氨基酸序列具有高度的同源性，均含有保守的2个β-羟基-β-甲基戊二酸单酰辅酶A结合基序和2个还原性烟酰胺腺嘌呤二核苷酸结合基序；均有信号肽，属分泌型蛋白质；属于跨膜的疏水性蛋白，均有5个跨膜结构域；无规则卷曲和α-螺旋是HMGR多肽链中的主要结构元件；三维结构预测都呈"V"字形；猪和牛HMGR基因的进化关系最近。

This paper consists of three parts: Firstly, we discuss a nonautonomous -species two-patches cooperative Lotka-Volterra diffusion system. Using Brouwer fixed-point theory and Liapunov function, under some conditions, we obtain that the system has a unique globally asymptotically stable positive periodic solution. Secondly, we consider a kind of nonautonomous predator-prey model, in which preys are with stage structure and the predator are with two patches.

中文摘要：本文分三部分讨论三类生态模型周期解或概周期解的存在性及全局渐近稳定性等内容：第一部分讨论了两斑块种群的互惠Lotka-Volterra扩散系统，运用不动点理论和构造Liapunov函数，得到了系统存在唯一一个全局渐近稳定的正周期解的充分条件。

Of a horse to move at an easy unhurried rate by lifting the two legs on one side and then the two on the other -- amble n.

骝花蹄马同侧的两腿同时举起在两侧轮流向前的轻松的马步

Because at that time he had not reached two years old and because he walked extremely hard, he brandished his two arms at full tilt. In addition to his thick clothes, we found on the ground his shadow like a penguin waggering in the snow or ice.

那时候他还不满两岁，由于行走的十分卖力，他的两条胳膊也是尽情挥舞，再加上厚重的衣服，当他走近灯光时，我们发现他在地上的影子如同企鹅———在冰雪中摇摇摆摆的企鹅。

One year at a prep school left students with four years of eligibility at a four-year university, as opposed to two years of eligibility after two years at a junior college.

学生在预备学习一年之后，就可以准备进入四年制的大学或是两年制的初级学院学习了。

Orders are being placed at very short notice. Seven days or two weeks maximum. Before it was two months.

企业在发出订单时，只会提前很短时间给出通知，最多提前一、两周，而以往是提前两个月。

Ldquo;Orders are being placed at very short notice. Seven days or two weeks maximum. Before it was two months.

ldquo；企业在发出订单时，只会提前很短时间给出通知，最多提前一、两周，而以往是提前两个月。

In system on chaos state, motion trajectory controlled by a equation is sensitive to initial conditions. For example, two trajectory from two close initial values were not very difference at short notice. But the distinct difference will presented consequentially after an enough long time.

混沌状态下的系统，按照某方程运行的轨道敏感地依赖于初始条件，例如从两个邻近的初值出发的两条轨道，在短时间内似乎差距不大，但在足够长的时间以后，必然呈现出显著的差别。

In fact, the arithmetic is not set up this way, the quality of nuclear helium than two protons and two neutrons, and the quality of fewer 0.0302 atomic mass unit [57]!

实际上，这样的算术并不成立，氦核的质量比2个质子、2个中子质量之和少了0.0302原子质量单位[57]！

Helium has an atomic number of 2, which means that helium has two protons and two electrons.

氦的原子数为2，此意即氦有二个质子和二个电子。

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。