The underling principle of swap is the existence of comparative advantage of resourses.
互惠掉换的基本原理在于发挥资源相对优势的作用。

The Resourses Distribution, Protection and Utilization of Wild Allium mongolicum Regel
野生沙葱的资源分布与保护利用

Application of Soursweet Herbs Nourishing Yin Method in Treatment of Anorexia in Children.
酸甘化阴法在治疗小儿厌食症中的应用

An early freeze in California sours the lemon crop.
一场早霜冻使加利福尼亚的柠檬腐烂。

He gradually eases himself into his chair. His expression sours.
他坐在椅子上，逐渐放松下来。

Watery part of milk produced when raw milk sours and coagulates.
当生奶变酸和凝固时，形成的像水一样的部分。

The sourses of the system that convicted crimals take care of their old or sick parents
存留养亲制探源

The cream sours in hot weather.
奶油在热天会变酸。

The inhomogeneity about enterprise resourses and customer demands is a base of the differential strategy.
企业资源与顾客需求的异质性是差异化战略存在的基础。

Have paith in people. Cynicism sours the disposition.
信任别人。愤世嫉俗使你的人格变质。

Have faith in people. Cynicism sours the disposition.
信任别人，愤事嫉俗使你的人格变质。

Can buy a dime a dozen, soft, and yellow, and tastes soursweet.
一角钱可以买十来个, 软软的, 黄黄的, 吃起来又酸又甜。

General business sours and car sales dip.
商业普遍不景气，汽车销售额下降。

Mans best friend is not feeling the love as the economy sours.
经济扭曲，人类最好得朋友也感受不到爱。

She is a kind of strong flavor wine which rich in tannins and fresh sours.
这是一款味道浓烈的葡萄酒，富含单宁及新鲜的酸味。

In many school systems girls are forbidden to take shop sourses.
在许多学校制度中禁止女学生修工科。