a movable hearth in a reverberating furnace, used for separating gold or silver from lead.
3
Zoology
the shell or integument of some invertebrates and protozoans, especially the chalky shell of a foraminiferan or the tough outer layer of a tunicate.
动词
1
take measures to check the quality, performance, or reliability of (something), especially before putting it into widespread use or practice.
this range has not been tested on animals
同义词：
try outtrialcarry out trials onput to the testput through its pacesexperiment withpilotcheckexamineassessevaluateappraiseinvestigateanalyzescrutinizestudyprobeexploresamplescreentechnical：assay
