Edge water blocking technology in viscous oil reservoir is a chemical blocking technology, which use fly ash as main agent and equip proper organic crossliner agent and curing agent.

稠油油藏边水封堵技术是以电厂废渣—粉煤灰做主剂，配以适量的有机胶联堵剂和固化剂，针对稠油油藏边水进行封堵的一种化学封堵技术。

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This works by blocking the chemical responsible for sending signals from the sympathetic nervous system to the sweat glands.

这是通过阻止负责从交感神经系统传送信号到汗腺的化学物质来运作。

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By blocking the release of a chemical messenger in the brain, the toxin stops muscles from contracting.

这种毒素阻止大脑释放一种化学信号，从而抑制肌肉收缩。

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Fabrizio Sanna and colleagues at the University of Cagliari in Italy injected oxytocin into particular parts of the brains of rats and induced yawning, or blocked the effect by injecting an oxytocin-blocking chemical first.

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Garret A. FitzGerald, a pharmacologist at the University of Pennsylvania, raised the first red flags about pharmaceuticals like Vioxx, Celebrex and Bextra after he saw chemical reasons that the drugs, which all inhibit inflammation by blocking the same enzyme, might cause heart attacks.

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It works similarly to many pesticides, by blocking the breakdown of acetylcholine, a major neurotransmitter, leading to a rapid buildup of this chemical in the body.

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