Make a date with your child for a specific day and time, and together you should decide what you want to do on that date.

和孩子约在某一时间或地点，可以一起决定在约会时做什么。

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If you are in sales, letting people know that a specific offer is only available to the first 20 people who respond by a certain date will make the offer appear more valuable.

如果你只做销售，弄清楚这个特别的工作只提供给前二十名给出答复的人，而且要在规定时间内提交才算符合要求，这样一来，这个工作的含金量就更重了一些。

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Those travelling on a more open schedule, or rather those who do not have a specific date pinpointed to make it up the mountain, can purchase their tickets in person at the Instituto de Cultural Nacional de Cusco located off the Plaza de Armas in Cusco, as well as the Machu Picchu Cultural Center in Aguas Calientes.

BBC: Securing tickets for Machu Picchu

It has been so long since a bin Laden message (and we always look in those messages for date markers - does he make reference to a specific event, such as the election, which would tell us he was alive at a certain date?) that I keep getting the same question: how do we know Osama bin Laden is still alive?

CNN: Bin Laden: Alive or dead -- and how would we know?