For diving there's small sealed tank inside, the negativetank.
为了下潜，里边还有个密封小水槽—负槽。
2
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。
3
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.