A light pointer is often useful with a slide projector.

光经常与幻片放映机一起使用。

There is a new projector in my office.

我的办公室里有一架新的幻机。

Sport and the movie have been inseparate since the projector had been invented by Thomas Alva Edison.

摘要运动与电影从爱迪生发明放映机那一刻起即结下不解之缘。

Optical projector, tension tester, pressure tester and torsiometer are the testing instru-ments. Testing results can be typed automatically.

检测设备有光学投影仪、拉、压、扭力测试仪，检测结果由测试仪自动打印。