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 drug affects one's power(s) of concentration. 这种药影响人精神不能集中。
- There is a concentration of people in big cities. 大城市人口集中。
- combustible concentration 可燃物的浓度
- He seized every chance to break out of the Nazi concentration camp. 他抓住一切机会从纳粹集中营跑出来。
- Celluloid is highly combustible. 赛璐珞是极易着火的。
- A state of mental concentration. 专心致志，全神贯注全神贯注的状态
- Exceptionally great concentration, power, or force. 特别强烈的程度，力量或动力
- Don't smoke near combustible materials. 别在易燃的材料附近吸烟。
- The POWs burst out from(of) that Nazi concentration camp one night. 一天夜里战俘们冲出了那个纳粹集中营。
- A combustible fuse for detonating explosives. 导火索用于引爆的可燃导火线
- To burn(a combustible solid)to a charcoal residue. 烧炭（将可燃烧固体）烧成木炭
- This material is not combustible. 此产品不燃。
- We must not take combustible goods aboard. 我们不可以带易燃物品上船。
- We mustn't take combustible goods aboard. 我们不可带易燃品上车。
- Stress and tiredness often result in a lack of concentration. 紧张和疲劳常使人精神不集中。
- To burn(a combustible solid) to a charcoal residue. 烧炭（将可燃烧固体）烧成木炭
- Concentration is essential if you want to do a good job. 如果你想把事情做好,专心是必要的。
- Contact with combustible material may cause fire. 与可燃物料接触可能引起火灾；
- The tennis players need total concentration during play. 网球运动员在比赛中需要全神贯注。
