The stages of oil generation, expulsion, migration and accumulation are determined through study of depositional history, oil generation and migration and accumulation history.

通过对沉积埋藏史、生烃史及油气运聚史的研究，确定烃源岩生、排烃及油气运聚期次；

youdao

And some people take this a step further, and they hypothesize that this migration actually provided an important impetus in the development of ancient Egypt.

有些人对这方面做了进一步的研究，并假设这次的迁移实际上为古埃及的发展提供了一个重要的动力。

youdao

We think of this as an old person's migration, but it created many jobs for the young in construction and health care, not to mention tourism, retail and restaurants.

我们认为这是老年人的迁移，但它在建筑和医疗保健领域就为年轻人创造了许多就业机会，更不用说在旅游业、零售业和餐饮业中了。

youdao

And hunger can lead to migration and conflict.

VOA: special.2010.06.08

Behind this environment are the great social processes of migration and modernization that produced that new urban form, the metropolis.

在这种环境背后是移民和现代化的重大社会进程,所带来的新的城市形式，即大都市。

耶鲁公开课 - 现代诗歌课程节选

And I feel like people have been making a migration from Manhattan to Brooklyn a lot.

我觉得很多人一直在从曼哈顿迁移到布鲁克林。

在布鲁克林的生活 - SpeakingMax英语口语达人

The purpose of the meeting held on 8 and 9 February 2013, in Chennai, on the campus of the RGNIYD, aims to develop a better understanding of migration issues, and highlight migration policies and the relevance of the Millennium Development Goals in this area.

UNESCO: THEMES

Conocimientos del pueblo Mayangna sobre la convivencia del hombre y la naturaleza: peces y tortugas, demonstrates the depth and breadth of local knowledge of the natural milieu, including behaviour, habitat, reproduction and migration patterns, and the introduction of new and invasive species.

UNESCO: Social and Human Sciences

And musicians come to hear the age-old songs with fifteen-syllable lines and themes of migration and survival.

BBC: The lost world of Olymbos