四级For now the app is also iPad-exclusive, and though a few of these educational institutions are giving the hardware away for free, for other students who don't have such a luxury it's an added layer of cost — and an expensive one at that.

目前，该应用程序也是iPad独有的，尽管其中一些教育机构正在免费赠送硬件，但对于其他没有这么奢侈的学生来说，这是一个额外的成本——而且是一个昂贵的成本。

2013年6月阅读原文

六级In some cases, colleges and universities might have to change their training programs, adding another layer of difficulty.

在某些情况下，学院和大学可能不得不改变其培训计划，增加了另一层难度。

2015年12月阅读原文

四级He wrapped one layer of the plastic around the card and tried again.

他在卡片上包了一层塑料，然后再试一次。

2016年6月听力原文

四级They're also only a single layer in what should ideally be a many-sided approach to securing your home, one that includes common sense things like sound locks and proper exterior lighting at night.

他们也只是一个单层，理想情况下应该是一个多方面的方法来保护你的家，一个包括常识的东西，如声音锁和适当的夜间外部照明。

2016年12月阅读原文

高考The keyboard could offer a strong layer of security by analyzing things like the force of a user's typing and the time between key presses.

通过分析用户打字的力度和按键之间的时间，键盘可以提供强大的安全性。

2019年高考英语全国卷I 阅读理解 阅读C 原文

四级The top layer of the earth is called the earth’s crust.

地球的顶层被称为地壳。

1989年1月英语四级真题

四级It sews leaves together in the shape of a cup then it adds a layer of straw to the inside of the cup and lays its eggs there.

它把叶子缝成杯子的形状，然后在杯子里面加一层稻草，在那里产卵。

2002年6月大学英语四级(CET-4)真题

四级As the tree grows it adds a layer to its trunk taking up chemical elements from the air.

随着树的生长，它在树干上增加了一层吸收空气中化学元素的物质。

2002年6月大学英语四级(CET-4)真题

四级For now the app is also iPad-exclusive, and though a few of these educational institutions are giving the hardware away for free, for other students who don't have such a luxury it's an added layer of cost--and an expensive one at that.

目前，该应用程序也是iPad独有的，尽管其中一些教育机构免费赠送硬件，但对于其他没有这种奢侈的学生来说，这是一个额外的成本——而且是一个昂贵的成本。

2013年6月大学英语四级考试真题(第2套)

四级For now the app is also iPad-exclusive, and though a few of these educational institutions are giving the hardware away for free, for other students who don’t have such a luxury it’s an added layer of cost — and an expensive one at that.

目前，该应用程序也是iPad独有的，尽管其中一些教育机构免费赠送硬件，但对于其他没有这种奢侈的学生来说，这是一个额外的成本——而且是一个昂贵的成本。

2013年 6月大学英语四级考试真题

考研Added to that is an atmospheric pressure about 90 times Earth’s: High overhead in the carbon dioxide (CO2) that passes for air is a layer of clouds, perhaps 10 to 20 miles thick, whose little drops consist mostly of sulfuric acid (H2SO4).

除此之外，大气压力约为地球的90倍：在进入空气的二氧化碳（CO2）的高空是一层云层，厚度约为10至20英里，其小水滴主要由硫酸（H2SO4）组成。

1990年全国硕士研究生入学统一考试英语试题

考研The true enemies of science, argues Paul Ehrlich of Stanford University, a pioneer of environmental studies, are those who question the evidence supporting global warming, the depletion of the ozone layer and other consequences of industrial growth.

斯坦福大学的Paul Ehrlich是环境研究的先驱，他认为，科学的真正敌人是那些质疑支持全球变暖、臭氧层消耗和工业增长的其他后果的证据的人。

1998年全国攻读硕士学位研究生入学考试英语试题