AD usually causes a headache due to vasodilation of brain blood vessels.
广告通常会导致头痛，由于脑血管舒张血管。
He usually puts it away… He read an ad at the paper.
他通常会把包放好… 他从报纸上看到了广告…
Therefore, for the same car model, PI are usually cheaper than the AD.
因此，为同一汽车模型、PI通常比较便宜的广告。
A classified AD is usually only a few lines long.
一条分类广告通常只有几行。
A classified AD is usually only a few lines long.
一条分类广告通常只有几行。
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