previewn.预审;试映;预习;预告vt.事先查看;预习
preventionn.阻止;妨碍;预防
preventive use预防性使用
preventive war预防性战争
preventive coil预防线圈
preventive eost预防成本
preventive care预防保健
preventive cost预防费用
preventive step预防措施
"the doctor recommended several preventatives"
"preventive medicine"
"vaccines are prophylactic"
"a prophylactic drug"