Ample oil reserves are still being discovered the world over, but they happen to be concentrated increasingly in the middle east . 世界各地仍在不断发现丰富的石油储量，但石油储量碰巧是越来越集中在中东地区。
He sat gripped, making himself pale and ghastly in his effort to concentrate on the book, to take in what he had to learn . 他正襟危坐，将注意力集中在课本上，汲取他必须学得的知识。他竭尽全力，搞得脸色苍白、恐怖可怕。
We now focus attention on electron 1 and regarded electrons 2, 3…n, as being smeared out to form a static distribution of electric charge . 我们现在把注意力集中在电子1，而把电子2，3…，n看成是弥散开形成一个稳定的电荷分布。
As we've seen, the laser is distinctive in that it emits all its energy in the form of a single, narrow, diffraction-limited beam . 我们已经看到，激光器的一个突出之点，就是把全部能量都集中在一个很窄的，由受衍射限制的光束内射出。
He fixed his attention on what he was doing 他的注意力集中在他正在做的工作上。
Dick : i ' m paying attention to the comic book 迪克：我把注意力集中在漫画书里了。
We must concentrate our attention on efficiency 我们必须把注意力集中在效率上。
This company concentrates on the chinese market 这家公司把重点集中在中国市场。
This firm concentrates on the european market 这公司把工作重点集中在欧洲市场
