There are two primary classes in the Boost MPI library that you must learn: the environment class and the communicator class.

您必须了解 Boost MPI 库中的两个主要类：environment 类和 communicator 类。

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If you're used to a very relaxing class, learning to develop in a strict environment is difficult.

如果你已经习惯了氛围轻松的课堂环境，那么在严肃的氛围下学习就会变得很困难。

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A paper from Science of the Total Environment shows that the largest freshwater fish in China might have gone extinct between 2005 and 2010. Wei Qiwei, author of the paper, said in September, 2019, some experts supposed that the first-class protected fish had been extinct already.

《整体环境科学》的一篇论文显示，中国最大的淡水鱼可能已经在2005年至2010年间灭绝了。2019年9月，该论文的作者危起伟表示，一些专家认为这种一级保护鱼类已经灭绝。

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There are probably those of you in the class already who are outraged by things like the modern food environment, how much energy it takes to transport things from place to place, lack of concern with sustainability and issues like this, and you'd like to see social change.

在坐的各位当中可能已经有人,对目前的食品环境感到愤怒,很多能量浪费在食品相关的运输上,忽略了对可持续性的关心等问题,你可能希望社会会有所改变

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Sabahy was born in the small town of Baltim and lived in a working-class environment there.

CNN: Hamdeen Sabahy, a champion for Egypt's dispossessed

"I grew up in an upper-middle-class environment and was well-prepared to take advantage of opportunities I came across, " he says.

NPR: The Few, the Tech-Savvy Few: Option Millionaires

So why not create a world-class environment where our talented scientists and engineers, rather than going overseas, can work right here on next-generation technologies?

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