基于上述特征事实，作者构建了一个包含货币扩散的动态量化贸易模型，从而将贸易成本、铸币决策、技术进步等因素纳入到分析古典时代经济地理的转变中去。此处，我们不对模型的细节做过多阐述，仅大致描述模型的构建思路和均衡条件。

作为宇宙中一颗耀眼的行星，地球是人类共同的家园！地球科学是一门古老而经典的基础学科，围绕宇宙演变规律和圈层相互作用，不断探索求真，已经发展成为涵盖地质学、地球化学、地球物理、大气科学、海洋科学、环境科学、地理科学以及交叉科学的综合性学科；聚焦行星演化 ...

XINING, June 18 (Xinhua) -- A new study has unveiled the key mechanism for alpine grassland carbon sink on the Qinghai-Tibet Plateau in western China, providing scientific underpinning for ecological ...

凯茜·伍德旗下的旗舰交易所交易基金（ETF）已从贸易战恐慌的深渊中强劲反弹，自四月初以来涨幅超过50%。然而，此番反弹非但未能恢复投资者的信心，反而招致了普遍的怀疑。

ISTANBUL, June 15 (Xinhua) -- Türkiye is set to launch a new tourism route in its northwestern Thrace region, featuring ancient dolmens and menhirs -- stone tombs and megalithic monuments dating back ...

日光丽思卡尔顿酒店（The Ritz-Carlton, ...

Join Tony Bott and his dear friend Annei Lee for an enchanting evening of music under the stars at Cotton's. The duo will perform a delightful mix of pop, R&B, jazz, and bossa nova, creating the perfe ...

The Pacific Ocean has hit pause and settled into ENSO-neutral conditions, which are expected to continue through the Northern ...

“In the saddle” is similar to “in the driver’s seat”, the latter referring to the seat on which a driver of an automobile ...

当很多事都被挤到你30多岁的时候，就会有巨大压力，在很短的时间内快速启动一项事业，挑一个城市，找到伴侣，生两三个孩子。这些事大多是不能同时完成的，正如研究表明，在30岁的时候要想工作生活一步到位，难度很高，压力很大。

惠誉评级（Fitch Ratings）于6月11日发布的报告称，受关税战、石油需求增长放缓以及欧佩克（OPEC）和其他国家增产的影响，全球经济面临不确定性，石油和天然气行业已进入新的恶化状态。

Forcing someone’s hand is an expression that finds its origin in bridge, the card game. Here, “hand” refers to the cards a player holds in his HAND. Specifically, “hand” in “forced his hand” refers to ...