For diving there's small sealed tank inside, the negative tank.
为了下潜，里边还有个密封小水槽—负槽。
Working principle: piston moves from left to right, form a negative pressure pump cylinder, the liquid tank into the pump by the inhalation valve cylinder.
工作原理：活塞自左向右移动时，泵缸内形成负压，则贮槽内液体经吸入阀进入泵缸内。
A poll released this week by the Levada Centre, a think-tank in Moscow, shows that 74% of Russians have a negative view of America, the highest number in Russia's post-Soviet history.
本周，一个在莫斯科的智囊团列瓦达中心公布的一项民意调查显示，74%的俄罗斯人对美国有着负面看法，这个人数在俄罗斯的后苏联历史上是最多的。
How it works: the piston moves from left to right, form a negative pressure pump cylinder, then the suction tank fluid through the valve into the pump cylinder.
工作原理：活塞自左向右移动时，泵缸内形成负压，则贮槽内液体经吸入阀进入泵缸内。
Full use of its bearing capacity of the tank to reduce the oil vapor emissions, the principle is to use the weight of the valve plate to control the breath pressure and suction tank negative pressure.
充分利用油罐本身的承压能力来减少油蒸气排放，其原理是利用阀盘的重量来控制油罐的呼气正压和吸气负压。
Full use of its bearing capacity of the tank to reduce the oil vapor emissions, the principle is to use the weight of the valve plate to control the breath pressure and suction tank negative pressure.
充分利用油罐本身的承压能力来减少油蒸气排放，其原理是利用阀盘的重量来控制油罐的呼气正压和吸气负压。
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