Boiler control system is composed of drum water level control system, stem pressure control system, hearth negative pressure control system and combustion economical control system.

锅炉控制系统可以分为汽包水位控制系统、蒸汽压力控制系统、炉膛负压控制系统和燃烧经济控制系统。

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"We found that the babies who died of SIDS had abnormalities in serotonin in regions of the brain stem that control breathing and heart rate and blood pressure during sleep."

VOA: standard.2010.02.08

After examining Scotty and confirming that the bullet hadn't entered his skull, and with the help of producer Shirley Hung, I applied a pressure bandage to stem the bleeding as we raced to a U.S. military base for more treatment.

CNN: Behind the Scenes: Shootings are painful reminder

Providing modern contraception also has the potential to stem population growth and relieve human pressure on the environment and natural resources.

CNN: The elephant in the room at Rio summit

Others have less rigid currencies but still intervene to stem what they regard as excessive upward pressure.

ECONOMIST: Currencies