逆先，拼音是nì xiān，汉语词汇，释义为预先。
先检查变频器的主回路，测量整流模块和逆变模块特性良好。
Check the main loop and measurement frequency inverter modules and rectifying module properties is good.
整流侧先投入旁通对，逆变侧后投入旁通对。
The bypass pair is firstly implemented at rectifier side then at inverter side.
结果表明，在变形后的保温过程中，形变诱导的铁素体先逆相变为奥氏体，同时伴随着诱导铁素体晶粒的长大；
The results showed that the deformation induced ferrite inverse transformed to austenite and grains growted within holding time after deformation.
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