permanently frozen ground造句
Whenthisnormallypermanentlyfrozengroundthaws,thewaterinthelakescanseepthroughthesoil,drainingthelake.Slowlythecarcass,morethanfourtimestheweightofabullelephant,appearsontotheicetobecutup,draggedtothev...
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permanently connected造句
ThesetractionmotorswithClassHinsulationarepermanentlyconnectedinmaticfieldweakeningisprovidedandmultiple-unitcontrolisfitted.Alogicfamilythatmaybeinoneofthreestatesratherthantheusualtwo-high,low,orhig...