The pile (described as a peak) is sucked in the long delivering pipe, which just fill up the concrete break (described as valley) due to piston shifting and the uncontinuity is improved.

• 这样就在正常的输送中形成了混凝土的一个“堆积”，这个“堆积”（比喻成波峰）在较长输送管路内被削弱正好可以填补刚刚由于双活塞切换而成的飞混凝土“断续”（比喻成波谷）使不连续现象得以改善。