正电子发射层析zhèng diàn zǐ fā shè céng xīzhengdianzifashecengxipositron emission tomography (PET)Characters in this word发to issue, to dispatch, to send out子son, child射to shoot, to eject, to emit层layer, floor, story, stratum析to split wood正straight, right, proper, correct, just, true电electricityStudy it in Yanamino