With certain conditions, the mass of component can be stilly substituted by several concentrated mass.

其基本思路是，构件的质量在满足一定的条件下，可由几个集中质量静替代。

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People search for love with certain conditions, but love does not happen even in the perfect combination of various conditions.

人们举着条件去找爱，但爱并不存在于各种条件的哪怕最完美的组合中。

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Like most foods (meat, milk, peanuts, nuts, berries, chocolate, etc.), there are people with certain conditions that should be more careful.

像大部分食物(肉、奶、花生、坚果、浆果、巧克力等)一样，有特殊情况的人群应当谨慎食用。

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Patients with certain conditions, including hiatal hernias, don't qualify for heartburn surgery through the mouth.

WSJ: New Surgical Option for Heartburn

The risks are especially serious for young people with certain conditions including heart problems, seizures, diabetes, and even behavioral problems and mood disorders.

FORBES: As Caffeinated Gum Hits The Shelves, FDA Jumps To Attention

People who qualify for a concessionary bus pass include senior citizens, people with learning disabilities, those with sight and hearing impairments and people with certain medical conditions or physical disabilities.

BBC: Western Greyhound and Cornwall Council bus subsidy deal