The main material of most masks is polypropylene.

大多数口罩的主要材料是聚丙烯。

youdao

8 honey royal jelly royal jelly contained in aspartate is "help" the main material.

蜂蜜，蜂王浆，蜂王浆中所载的天门冬氨酸起“帮助”作用的主要原料。

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Pear vinegar is a kind of fruits vinegar made of pear as the main material by crushing.

梨醋是以梨为主要原料，经破碎、榨汁、酒精发酵、醋酸发酵而成的一种果醋。

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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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Mr Morales used to grow coca leaves - the main raw material for the drug but also a key part of indigenous traditions in Bolivia.

BBC: President Evo Morales on 10 March 2011

Plant oils consist of fatty acids combined with glycerol and these fatty acids (for example, those from palm oil) are the main raw material for the biodiesel already sold today.

ECONOMIST: Advanced biofuels