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1·I hope I can concentrate in this heat.

我希望可以在这么热的天气集中精神。

2·Hemoglobin, as you know, is an oxygen carrier and so red blood cells concentrate in bags of hemoglobin which circulate in your blood and they carry oxygen.

如你所知，血红蛋白是氧气的载体，所以红细胞集中在血红蛋白的袋子里，血红蛋白在血液中循环，它们携带氧气。

3·Doctor, I haven't been able to get enough sleep lately, and I'm too tired to concentrate in class.

医生，我最近睡眠不足，上课也很困倦，无法集中注意力。

4·I guess with fewer places to inhabit, they concentrate in great numbers in few areas, which surely makes them easier targets for the hunters.

我猜，由于栖息地越来越少，它们就会大量集中在少数地区，这无疑会使它们更容易成为猎人的目标。

5·These groups concentrate in the inner cities.

这些人集中在内地城市。

6·Birds concentrate in places where food is abundant.

鸟聚集在食物丰盛的地方。

7·His third army was now directed to concentrate in Louisiana.

第三军团奉命集结于路易西安那州。

8·I no longer looked bright, and I couldn't concentrate in school.

我不再显得生气勃勃。我在学校里也无法集中注意力。

9·Second, I usually have to concentrate in class listening to reason.

第二，我平时上课时都专心听讲的的缘故。

10·The local P-version adaptive zone is upgraded concentrate in stress-singularity zone.

而且，局部P加密的区域也集中在应力奇异的部位。