Clever spiders a chemical used by golden orb web spiders to keep ants at bay could make a useful pest control agent, say researchers.

研究者说。聪明的蜘蛛利用一种自身的化学制品A把蚂蚁困在他们的金色圆形蜘蛛网里，这样蜘蛛就变成了一个害虫防治机构。

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An acid additive used in acidizing that is either a a sequestering agent used to complex iron ions orb a reducing agent such as erythorbic acid used to reduce the oxidized state of iron.

在酸化作业中所用的一种酸添加剂。它可为用于络合铁离子的螯合剂，或为用于使氧化状态的铁还原的还原剂(如赤藓酸)。

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