套牢是指进行股票交易时所遭遇的交易风险。例如投资者预计股价将上涨，但在买进后股价却一直呈下跌趋势，这种现象称为多头套牢。相反，投资者预计股价将下跌，将所有股票放空卖出，但股价却一直上涨，这种现象称为空
I want to build a train arrival time reference app, that lets me choose different stations and displays times from A to B, and times from B to A. So I\'m using Apple\'s Page Control because I want to
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