It contains a telescope, a compass, and a protractor, and it's used to measure horizontal and vertical angles.
一个指南针，一个测角器，它用来测量水平和垂直的角。
2
According to the structural design scheme for horizontal shafting of a large-aperture telescope, the structural analysis model is established by means of the structural analysis software I-DEAS.
A non-polarizing beam-splitting cube at the output of the receive telescope performs Bob's random choice of polarization state measurement: either horizontal (H), or –45 degrees.