valve reversal

• 阀倒转

valve reversal的用法和样例：

例句

1. 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。
2. 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。