It is also possible to trace back from lower to higher levels of abstractions.
从低层级到高层级的抽象也是可能的。
These verbs mean to move something from a lower to a higher level or position.
这些动词的意思是使某物从较低移到较高水平或位置。
In an open valve, fluid flows in a direction from higher pressure to lower pressure.
在打开的排气阀，流体流动的方向，从更高的压力，降低压力。
In an open valve, fluid flows in a direction from higher pressure to lower pressure.
在打开的排气阀，流体流动的方向，从更高的压力，降低压力。
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