The circulation of materials is pushed by a big flow and low-lift axial flow pump.

料浆的循环靠大流量、低扬程的轴流泵推动。

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Studies on the role of coastal microbenthos in energy flow and circulation of materials in marine ecosystems;

对沿海小型底栖生物在海洋生态系统能流和物质循环中的作用研究。

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The mechanism of artificial soil represents the movement process of material balance, material conversion, material flow and circulation of materials in the human society and nature.

人造土壤机制体现出人类社会和自然界中，物质平衡、物质转化、物质流动与物流循环的运动过程。

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Whereas earlier copyright law, including international agreements like the 1886 Berne Convention, had been written to regulate the circulation of printed materials, the Rome Convention responded to the new circumstance of ideas variously represented in easily reproduced units by covering performers and producers of recordings under copyright.

UNESCO: UK National Commission for UNESCO - UNESCO Conventions, Recommendations & Declarations in the UK

To sum up John Maynard Keynes, it can even make sense to bury money in bottles, so that miners, and the suppliers of their pickaxes and overalls, and those who sell food and materials to those suppliers can, in turn, benefit from the circulation of money that they dig up.

ECONOMIST: What did Barack Obama��s stimulus package really achieve?