您要查找的是不是：
- His area of concentration is nuclear physics. 他的专门研究范围是原子物理学。
- The proposal set a time limit of one year. 提案规定了一年的限期。
- The drug affects one's power(s) of concentration. 这种药影响人精神不能集中。
- A withdrawal limit of $200; no minimum age limit. 提款数量最多不超过200美元; 没有最低年龄限制。
- She has reached the limit of her patience. 她已到了忍无可忍的地步。
- That fence is the limit of the schoolyard. 那堵围墙是校园的界限。
- Stress and tiredness often result in a lack of concentration. 紧张和疲劳常使人精神不集中。
- He is the limit of irresponsibility. 他的不负责任到了不能容忍的程度
- An exam demands a high level of concentration. 考试时需要全神贯注。
- The drug may affect your powers of concentration. 这种药可能会影响你的注意力集中。
- This book requires a great deal of concentration. 这本书需要全神贯注才能读懂。
- He is a boy with little power of concentration. 他是个注意不易集中的男孩。
- We were near the limit of German manpower. 德国人力已将近枯竭。
- He has great powers of concentration. 他注意力很集中。
- It is beyond the limit of my ability. 这超出了我的能力。
- His area of concentration is economics. 他专心研究经济学。
- I feel cramped by the limitations of my job. 我觉得受工作束缚,没有什么奔头儿。
- The Determination of Concentration for SO_2 Gase. SO_2气体浓度的测定
- The time limit of detention is 15 days at most. 拘留的期限，为十五日以下。
- The limit of the theoretically possible universe. 理论上可能的宇宙之界限
