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By modeling six kinds of linear and non-linear optimal forecast combining models,this paper com- pares the performance of the linear and non-linear forecast combining methods,as well as neural network methods and other optimal combination methods.

1引言在实际预测工作中，某些模型在某个特定的时间或系统之下具有良好的预测效果，但是面对动态的变化的现实，采用任何单一的预测方法均不可能在任何经济状态下都达到令人满意的效果。

Dielectric cylinders of unknown permittivities are buried in one space and scatter a group of unrelated waves incident from another space where the scattered field is recorded.

设一未知的不均匀双轴性介质复杂物体掩埋在其中一空间中(不论是在半空间或三层空间中)，吾人可在另外的空间中适当的安排一组具有不同入射和极化方向的无关联波照射物体并量测在此之散射场，利用简单的矩阵运算，我们就可以克服非线性和不良情况的发生的困扰，进而重建双轴性复杂物体的介电常数分布。

By analyzing the ratio of carbon-14 to nitrogen-14, researchers can determine, within a narrow margin, when the sample in question last breathed or photosynthesized .

通过分析碳14和氮14的比例，研究人员能够以极小的误差确定被研究的标本最后进行呼吸的时间或最后进行光合作用的时间。

Spyware is a problem that plagues most of us at some time or another.

间谍软件是一种困扰的问题，在一段时间或其他我们大多数。

Split movies by presetting the exact start and end time or just dragging the slider bar.

通过预设的开始和结束的确切时间或只是拖动滑块拆分电影。

Regular practice of this pose rejuvenates the entire body and gently stimulates your nervous system.

保持此姿势一段时间或更长，可以刺激和帮助恢复疲倦，有规律地练习次姿势可以还原整个身体，释放紧张。

If you want a nice room you do have to book a deluxe room and request a renovated room.

如果想要一间不错的房间，你就订豪华间或重新装修的房间。

Some have extended the school year, or reorganized it to avoid a long summer break.

一些学校已经延长一年里学生上学的时间或做一些改变来避免一个长的暑假。

"For as long as it has been recorded, the history of the Hmong has been a marathon series of bloody scrimmages, punctuated by occasional periods of peace," writes Anne Fadiman in "The Spirit Catches You and You Fall Down," about Hmong in the United States.

&从有记载以来，苗族的历史就是一个马拉松式的漫长的血泪的历程，间或偶尔的和平时期，&Anne Fadiman在她《丽亚的故事》（副标题为&恶灵抓住你，你就跌倒&）一书里写到——这是本关于美国苗族的书。

Time still to be served or a debt to be paid.

要付出的时间或要偿还的债务。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。