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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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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