试验, 提炼

Try out \Try out\, v. i.
to compete for a postition, as on a sports team or in a
theatrical presentation.
[PJC]


Try out \Try out\, v. t.
to use (something not previously used) to determine its
fitness for a particular purpose; also, to attempt (a deed)
to determine if it will accomplish a particular purpose.
[PJC]