转动上半身，使左肩朝向被摄体。
Turn your upper body so that your left shoulder is pointing towards your subject.
圆形的砖混地基底座是固定的上面安装了钢轨而房体就由一台小型电动马达驱动在钢轨上转动。
Its circular brick-and-cement foundation is stationary, supporting a steel track on which the house revolves, moved by a small electric motor.
考虑到转动体的稳定过程相对复杂，有必要通过实验来检测其微振动状态。
Considering the complexity of rotor's stabilization process, it is necessary to detect the tiny vibration of the rotor by experiment.
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