plain to对 ... 是清楚的
plainadj.清楚的;简单的;坦白的;平常的;朴素的;纯的n.平原;广阔的区域adv.完全地;纯粹地
plain film mammography平片乳腺摄影
plain cylindrical form普通圆柱形
Plain-winged Antwrenn.纯色翅蚁鹩
plainclothes policeman便衣警察
plain-barrel ed roll平辊
Plain of mountain area山前平原
plain and figure weave平纹地提花
Plain English Movement英语简明化
plain film of vertebra脊椎平片
plain glass spectacles平光眼镜