Why is it important for paper or board to be acid-free and lignin-free?

I placed it in acid free paper and set it aside for later restoration.

俺把它在酸性纸并搁置以后恢复.

Printed on acid-free paper.

可浏览文摘.

Acid-free, contains 50 % recycled fiber.

无酸, 包含50%可回收纤维.

Performance characteristics of-prepared acid free non-ironing finishing agent PC was investigated.

探讨 自制 聚羧酸型无甲醛免烫整理剂PC的 应用性能.

Two-photon microfabrication ( TPM ) technology need data preparation software for transforming CAD models to fabricating data.

双光子加工技术需要通过数据准备软件将CAD模型转换为加工数据.

A steel wire screen above the office's credenza.

一张钢丝屏风悬挂在办公室的书柜之上.

Credenza with 2 cabinets. Door clearance can be shown or hidden.

带有两个橱柜的书柜. 可显示或隐藏门的净空.

Economic Justice for women has always been one of our key grant making themes.

在过去五年的拨款中,经济平等一直是妇女动力基金的重点拨款范畴.

The law does not discriminate against any race , creed or color.

此条法律没有种族、宗教、肤色歧视.

No one has any right to deny another person's creed.

没有人有权力否认他人的宗教信仰.

That is the creed of this site.

这就是我们的信条.

Here is a message that transcends the rites of any church or creed.

大自然在此的启示胜过任何一种宗教的仪式或教义.

The article thinks, problem of wage price rigidity is the central problem of new Keynesia creed.

本文认为, 工资价格刚性问题是新凯恩斯主义的中心问题.

Torn apart by creed! What about us?

被无情的教义撕裂! 我们如何?

The information in this book is up the creed because it was written so long ago.

这本书成书已久,故其中的信息是错误的.

He created the Olympic Charter, the Creed, the athlete's Oath, the opening and the closing ceremonies.

他制定了奥运会会章 、 信条和运动员誓词, 规定了开幕式和闭幕式的仪式.

Rather than being a code or creed, the test appears in the form of questions.

四大考验不是法规,也不是教条, 而是以问题的方式呈现.

Up until this point, everything in the Creed has been either invisible or distantly historical.

直到此时, 之前所有在信经中提到的事要么是看不见的,要么是历史久远的.

What point in the antislavery creed would you have me argue?

关于反奴隶制的纲领你们要我说明哪一点 呢 ?

Conservatives now argue, however, that Mr Obama has carried this creed into office.

但是, 现在保守派认为奥巴马先生已将这个信仰带入了白宫.