preventer

effective as preventers of further infection.

作为进一步感染的防止药物是有效的。

While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.

国内欠平衡钻井普遍实施,要用到的旋防喷器是关键设备,技术含量高。

Note: A strainer is recommended to be installed ahead of the backflow preventer to prevent the fouling of the check assembly and resulting spillage from the valve during repressurization.

注：建议在防前安装一个过滤器，防止由于止总成受到污染而导致这在再增压期间产生泄漏或溢出。