What happens is this: the water column gradually heats, but highpressure keeps the deeper parts from boiling.
这一切是这样发生的：水柱被逐渐加热，但是压力使深处的水不能沸腾。
2
This is important because a highpressure drop would mean that more energy is required to drive the vapour up the distillation column.
这一点很重要，因为如果压力下降太大，就意味着需要更多能量来推动蒸气上升。
3
This isocratic system consists of a highpressure solvent delivery pump, an UV/VIS detector, a manual injection valve, and a solvent tray, a column and a Chromatography Workstation.