convenience sample meaning in English

方便样本
方便样品

These data were collected with convenience sampling method from 75 hemolymph neoplasm patients and 75 general patients ( control group )
以75位血液肿瘤患者为研究对象； 75位一般住院患者为对照组。
Material : convenience sampling was employed to collect questionnaire samples from 400 individuals who were interviewed from the patients of one particular dental clinic in tainan city
材料：以台南市某牙科诊所病患为研究对象，计400人，采问卷调查法以便利抽样方式进行。