With the amount we make falling as we age, the protein has become a key ingredient of many creams that claim to rejuvenate the skin and smooth away wrinkles.

随著年龄的增长，骨胶原含量会慢慢降低，于是许多面霜便鼓吹这一成分能抚平皱纹，恢复肌肤活力。

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Though crude oil is the main ingredient of gasoline, processed foods like cereal, crackers or cookies use only a small amount of corn, wheat and other grains, limiting manufacturers' pricing power.

尽管原油是汽油的主要成分，而在谷类食品，脆薄饼和饼干的生产过程中，只需要使用非常少量的谷物，小麦和其他原材料，限制了制造商对价格的控制。

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Once the most important ingredient in every Japanese meal, the average amount of rice eaten each day has shrunk by more than 50 per cent over the past 40 years.

大米曾是日本人餐桌上最重要的食品，而在过去40年中，日本人的日平均大米消耗量减少了50%多。

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And worse,he says, there is no listing of the amount of each ingredient.

VOA: special.2009.07.22

The main ingredient is a small amount of mercury, which is placed inside a strong yet light container made of a composite material such as Kevlar.

ECONOMIST: Mirror, mirror

Then there is a third class, known as similares, medicines which, drugmakers pledge, have the right amount of active ingredient but aren't tested in the body.

FORBES: Magazine Article

So while the additional dissolved iron triggered an earlier-than-usual phytoplankton bloom, as the metal triggered growth in a greater number of phytoplankton cells, the bloom was only 15-20% larger than normal because the growth was limited by the amount of available nitrogen, another vital ingredient required for the organisms to develop.

BBC: Iceland volcano ash cloud triggers plankton bloom