This product is used for central air conditioning system circulating water detergents.

本品用于中央空调循环水系统除垢剂。

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With technical details of the security system already circulating on the Internet, instructions for cracking it will almost certainly make their way into the computer underground.

由于保安系统的技术资料已在因特网上流传，如何侵入该系统的指令也当然会流入非法人员所用的计算机中。

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It also appears to lower levels of ghrelin, the 'hunger hormone', circulating in the digestive system.

同时人体中一种在消化系统循环中被称为“饥饿激素”的物质的水平也有明显的下降。

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The gravity-based system responded as it was designed to, circulating water and steam in a continuous loop to keep the scale-model reactor at a safe temperature automatically.

CNN: Today/Tomorrow - Helping nuclear plants keep their cool

By mimicking the conditions created by melanomas, they showed that in the presence of tumour cells, the immune system sent out IgG4 antibodies, but when faced with healthy cells it functioned as expected with IgG1 circulating.

BBC: Skin cancer 'able to fight off body's immune system'