标尺

Item: Hybco Model 1920 Optical comparator with 10 diameter cross line screen with protractor ring and tool makers chart, with vernier scale, 20X lens with positioning compound giving longitudinal and cross adjustment, power supply and brackets for mounting on model 3000 TC.

项目：Hybco Model 1920 光学投影仪。带360度量角器和刀具制作图表的十字线投影屏直径10英寸，带游标尺，可横向，纵向调节的20倍镜头，3000TC用电源与支架。

Cepheid variable stars – a class of stars named in honor of Delta Cephei – serve as cosmic yardsticks, enabling astronomers to measure the distances to faraway galaxies.

造父变星——以无尚荣誉的Delta Cephei——充当宇宙的标尺，使得天文学家可以测量更为遥远银河星系。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。