These numerous examples of cross-reactions raise another question: why does Bet v 1 cause an allergy to the Mal d 1 protein but not the other way around?

这么多交叉反应的例子提出了另一个问题：为什么Bet v 1会导致对Mal d 1蛋白质的过敏，反过来Mal d 1却不会导致Bet v 1过敏？

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The practical space method for calculation of internal forces is adopted for structure design and the stresses of important cross section are checked by 3-D FEM.

结构设计时可采用作者提出的实用空间法计算内力并进行配筋设计，用三维实体有限元方法校核主要受力断面的应力状态。

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This dissertation is concerned with the problem of reconstructing the surfaces of 3-d objects from a collection of planar contours representing cross sections through the objects.

本文主要关注基于轮廓数据的三维物体对象曲面重构问题，轮廓表示着一系列通过物体对象的断层截面形状。

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Well, a cross-sectional study would mean that you'd get a random group of the population and measure them in 1970 and then take another random group five years later and measure them, but it wouldn't be the same people necessarily, it would be different groups of people.

那么,横断面研究就是,1970年你在人群中随意选择一组人,并记录下相关数据,然后,五年后再随意选择一组人记录数据,但这不需要是同一组人,通常是不同的人

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

"In order to make the costs workable, we realized we'd have to cross-sell agricultural commodities, " he says.

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"The window in which 3-D looks 3-D on that screen and doesn't appear fuzzy or make you feel cross-eyed, is extremely narrow, " he writes.

CNN: Nintendo unveils handheld 3-D gaming system

Mr d'Estais says he can cross-sell more savings products in the bank's newer branches.

ECONOMIST: The secret of a French bank��s success