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The principal of buffer is described as follows.At impulsing down,the piston moves down and vacates the annular space.The pressure in respiratory cavity decreases to a certain level and the traveling valve opens.At that time,the liquids enter into traveling valve and cavity and the plunger is impulsed upward to carry out the gentle transient at the sudden change.When the upward impulsing begins,the respiratory cavity is subjected to pressure and the traveling valve closes.During the gradual pressure rising,the liquids in respiratory cavity effuse from the upper ventage and the sudden change of force-summing direction of plunger is relieved relying on the resistance of ventage.

其原理大致是：下冲程时，活塞向下运动，让出环形空间的体积，呼吸腔内压力下降，下降到一定水平后，游动阀打开，此时，游动阀和小孔同时进液，使柱塞在从上死点处突然改变方向向上运动时得到缓冲，实现了柔和过渡；当上冲程开始时，呼吸腔受压，游动阀关闭，在压力逐渐上升的过程中，呼吸腔内的液体从上部的小孔流出，并依靠小孔的阻力使柱塞受力突然换向得到缓冲。

Price elasticity of demand measures the percentage change in quantity demanded caused by a one percent change in price.

需求的价格弹性衡量的是价格上每百分之一的变动所引起的需求量上变化的百分比。

Income elasticity of demand measures the percentage change in demand caused by a one percent change in income.

需求的收入弹性衡量收入中百分之一的变化所引起的需求中百分比的变化。

Price elasticity of demand is calculated as the percentage change in quantity demanded divided by the percentage change in price.

如果需求曲线是富有弹性的，如果需求曲线是富有弹性的，总收益随着价格的上升而减少。

Price elasticity of supply is the percentage change in quantity supplied resulting from a percent change in price.

供给弹性等于由于价格变动所导致的供给量变动的百分比除以价格变动的百分比。

Summary n n The price elasticity of supply is calculated as the percentage change in quantity supplied divided by the percentage change in price.

小结 n 供给的价格弹性等于供给量的变化百分比除以价格的变化百分比。百分比除以价格的变化百分比。

Superdelegates are declaring, and we are toward the end of the primary season, so she needs to change the psychology of the Democratic race, change the dynamic and start to raise questions about Senator Obama's electability down the road.

超级代表已经宣布了。我们的初选即将走向尾声。所以，她需要改变参加民主党竞选的心态，调整动作，并在余下的竞选道路中开始质疑奥巴马参议员的当选能力。

In the second elegy, also, the intention seems to be, with the change of strophe, to change from the third person to the second, and from the second to the first person.

在第二个挽歌，也意图似乎是，随著变化strophe ，改变从第三人的第二次，从第二到的第一人。

The results show that some elemental contents change obviously after cerebral ischemia and change with time.

结果表明，某些元素的含量在脑缺血后有显著变化，并随时间而变。

Any change in the spelling of an available name other than a mandatory change or an emendation Art.

除了强制性的改变或一项修正之外，对一适用名称的拼法所作的任何改变均称之[第33条3]。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。