projections投影图projectionn.投影；投射；规划；发射；凸出物；预测；放映Projection Map System投影地图系统projection objectives投影物镜projection print plate投影掩模projection type chaser投影式螺纹梳刀projection diapositive幻灯片projection eye-piece投影目镜projection TV receiver投影电视接收机projection uncertainty抛射不确定性projection coordinates射影坐标projection inheritance投影继承