按以下顺序付钱：需求第一，目标第二，额外的东西第三。
Pay for things in this order: needs first, goals second, and extras third.
不然，你可以按路程付钱，每一趟50美分到2美元不等，这样根据你坐的路程远近而定。
Otherwise, you can pay by trip, which is about 50 cents to 2 dollars each trip, depending on how far you go.
按点击率要价的方式总体要价更低，因为你为广告的每次点击付钱——但如果没有点击率，Facebook可以停止投放你的广告。
The cost-per-click approach could cost less overall, since you're paying only for each time someone clicks on the AD — but Facebook could discontinue your AD if it gets no clicks.
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