他的经济实力可以撑过这次房地产市场萧条期。He can afford to sit out the property slump.尽管还处于萧条期，利润却迅猛增长。In spite of the recession, profits have galloped ahead.经济正处于萧条期。The economy is in the doldrums....
消防员须身穿保护装置及正压呼吸设施.Firemen should wear proper protective equipment and positive pressure self - contained breathing apparatus.可以工作在正压或负压下, 简单的螺丝刀调节, 多种弹簧可选.They work under pressure or suction. Simple screwdriver adjustmen...