n.翻转；倒转；反转
Tilting disc check valves are used to prevent reversal of flow in horizontal or vertical pipe lines. 翻转式阀瓣止回阀适用于防止水平或垂直管路上的流体倒流。
When the next reversal occurs, the several generations of scientists who study it will know much more about the effects. 当下一次倒转发生时，从事这项研究的几代科学家将对有关的效应知道得更多。
In order for a reversal to take place there must be a brief time during which the field is non-existent. 为了发生一次倒转，必须有一个很短的时间没有磁场存在。
Each reversal appears to have taken place in a very short time. 每一次反转看来都是在极短的时间内发生。
It provides an early reversal warning after a new high or low. 出现了新高或者新低后，它给出了一个早期的反转警告。
n.点信号
