贵州的民族节日主要集中在4月和5月。
Ethnic festivals in Guizhou are concentrated in April and May.
由于对农村居民的交通需求了解很少，因此第一阶段，即1985年12月到1987年12月，主要集中在调查研究上。
Little was known about the transport demands of the rural households, so Phase I, between December 1985 and December 1987, focused on research.
今年2月，当我们把广告投放集中在廉价车型上，并在我们的地段和陈列室展示这些车型时，整体销量有所下降。
In February, when we focused our advertisements on our inexpensive models and featured them on our lot and in our showroom, overall sales were lower.
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