例句與造句

1. vomiting is normal at the onset of labor, but persistent vomiting may be a sign of illness
   嘔吐在分娩過(guò)程中是正常現(xiàn)象，不過(guò)持續(xù)性的嘔吐有可能會(huì)是疾病的表征。
2. It's difficult to find persistent vomiting in a sentence. 用persistent vomiting造句挺難的