Concentrating is difficult , even just to type this update .

集中注意力是非常困难的，即使只是更新这个博客都很困难。

School financing in the us , based on local property taxes , is a strong force for concentrating advantage across the generations .

在美国，教育经费与当地的财产税有关，作为一项副产业聚集了各代的优势。

Maybe that 's why I had a hard time concentrating on my essay .

也许这也能说明为什么我总是无法集中精力写我的申请文章。

Just about everyone has trouble concentrating or paying attention in class from time to time .

几乎每个人都很难在课堂上一直集中精力或集中注意力。

To improve content , they are concentrating on hiring software engineers rather than hardware experts .

为了提高产品的容量，他们集中招聘了软件工程师而非硬件专家。