There have been attempts to breed reek for simple, easily-domesticated labor and a source of food and materials.

曾经有人尝试将力克驯化成容易驯养的畜力和食物及工业原料来源。

youdao

They keep our air clean, reduce noise pollution, improve water quality and provide food and building materials.

他们保持我们的空气清洁，减少噪音污染，改善水质，提供食品和建筑材料。

youdao

A daily input of water, food, and energy of various kinds is matched by an output of sewage, solid waste, air pollutants, energy, and materials that have been transformed in some way.

日常摄入的水、食物和各类能量与输出的污水、固体废物、空气污染物、能源和经过某种转化的物质相匹配。

youdao

The American-operated ship carried thousands of tons of agricultural materials for the World Food Program and other aid organizations.

VOA: special.2009.05.27

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.

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Britain was thus able to concentrate on manufacturing and import its food and raw materials.

ECONOMIST: World trade

"Unless such restrictions are stopped, the civilian population will continued to suffer from shortages of medical care, food and shelter materials, " the statement said.

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