When object rub against each other, static electricity is produced.

当物体互相摩擦时, 静电就会产生.

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Be careful not to rub against the wet paint.

留神别蹭在没干的油漆上.

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What will be produced when two different kinds of insulators rub against each other?

当两个不同的绝缘体互相摩擦会产生什么?

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Volcanic lightning occurs when roiling ash particles rub against each other and become electrically charged.

当激流般的火山灰粒子相互摩擦带电而产生了火山闪电.

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This is when the complexity of relational databases starts to rub against their potential to scale.

这时候关系数据库的复杂性就开始影响其潜在的扩展规模了.

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