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The main material of most masks is polypropylene.

大多数口罩的主要材料是聚丙烯。

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The physiocrats, too, stressed material goods, and agriculture was the main material product.

重农主义者也强调了物质商品，而农业是当时主要的物质产出。

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Iron ore, the main raw material of steel, changed the lakes area and the nation.

VOA: special.2009.11.11

The connective tissue is one of those four main types of tissue, they're supporting material - supporting tissues that surround other cells in the body and give the cell - and give the body much of its mechanical property.

结缔组织是四种主要组织类型中的一种,它们是支持物--是,包围在体内其它细胞周围的支持组织,并赋予身体大部分的机械性能

耶鲁公开课 - 生物医学工程探索课程节选

For Dow Chemical,the main focus will be producing material from algae that can be used to make plastics.

VOA: standard.2009.09.02

For 3, once nylon had been discovered and proven useful, the race was on, given the supply of cheap oil (the main raw material) post WWII, from the Arabian Gulf.

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The mine was shut down by the U.S. Mine Safety and Health Administration due to the unsafe buildup of sand and concrete material in the main shaft of the mine.

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Husband-and-wife filmmakers Nancy Meyers and Charles Shyer also created the successful remake of "Father Of The Bride, " and they once again display a deft touch for updating material even though the main story device is hopelessly outdated.

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