This costs a few dollars, generally about half the cost of a sponsor AD.
这个成本几块钱，一般约一半的费用，赞助广告。
They concentrate on different times of history, which are generally divided by first century, AD.
他们专注于不同时代的历史，一般都是由世纪，也就是我们今天所说的公元划分。
They concentrate on different times of history, which are generally divided by first century, AD.
他们专注于不同时代的历史，一般都是由世纪，也就是我们今天所说的公元划分。
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