When we first come down to the ______________ by escalator or elevator, we can notice different guiding signs along the way. 我们第一次乘自动扶梯或电梯到______________的时候，我们会注意到沿途不同的路标。
A、station hall 车站大厅
B、compartment 隔间
C、platform safety gate system 站台安全门系统