concentrate的過(guò)去式和用法例句

　　concentrate做動(dòng)詞有專心;集中;濃縮等意思，那么你知道concentrate的過(guò)去式是什么嗎?下面學(xué)習(xí)啦小編為大家?guī)?lái)concentrate的過(guò)去式和用法例句，希望對(duì)大家的學(xué)習(xí)有所幫助!

　　concentrate的過(guò)去式和其他時(shí)態(tài)：

　　過(guò)去式: concentrated

　　過(guò)去分詞: concentrated

　　現(xiàn)在分詞: concentrating

　　concentrate的用法：

　　concentrate的用法1：concentrate的基本意思是指“吸引到或固定在一個(gè)中心之上”,既可指能被聚集、集中的事物,也可指縮聚于一點(diǎn)以增強(qiáng)其力量和強(qiáng)度的物質(zhì),強(qiáng)調(diào)人的技術(shù)、方法或努力程度，引申可指把注意力集中于…之上。

　　concentrate的用法2：concentrate作“集中”“聚集”解時(shí),可用作不及物動(dòng)詞,也可用作及物動(dòng)詞。其后接at, in等介詞,表示“集中在…”，后多接表示地點(diǎn)的名詞。

　　concentrate的用法3：concentrate作“濃縮”解時(shí),是及物動(dòng)詞,接名詞或代詞作賓語(yǔ)。

　　concentrate的用法4：concentrate作“專心于”解時(shí),可用作不及物動(dòng)詞,也可用作及物動(dòng)詞,其賓語(yǔ)多為attention, mind, energies, efforts或thoughts等詞,賓語(yǔ)后面接介詞on,表示“把…集中在…之上”。

　　concentrate的用法5：有人認(rèn)為,動(dòng)詞concentrate本身帶有“集中精神”或“思想集中”的意思,因此后面不應(yīng)再有mind, thoughts等一類的詞。

　　concentrate的過(guò)去式例句：

　　1. The living organisms somehow concentrated the minerals by biological processes.

　　生命體通過(guò)某種生物過(guò)程聚集礦物質(zhì)。

　　2. Mr Prescott concentrated on offering a classic restatement of Labour values.

　　普雷斯科特先生專注于對(duì)工黨價(jià)值觀進(jìn)行經(jīng)典的闡釋。

　　3. Most development has been concentrated in and around cities.

　　土地開發(fā)主要集中在城市及周邊地區(qū)。

　　4. Italy's industrial districts are concentrated in its north-central and north-eastern regions.

　　意大利的工業(yè)區(qū)集中在該國(guó)中北部和東北部地區(qū)。

　　5. In a brief statement, he concentrated entirely on international affairs.

　　他作了一個(gè)簡(jiǎn)短的聲明，集中闡述了在國(guó)際事務(wù)方面的立場(chǎng)。

　　6. He made a concentrated effort to finish the work on time.

　　他全力以赴以按時(shí)完成這項(xiàng)工作。

　　7. He was calm and concentrated in judging how to defeat his opponent.

　　他冷靜沉著,聚精會(huì)神地判斷如何打敗對(duì)手.

　　8. He concentrated his pupils and declared the exciting news.

　　他把他的學(xué)生集中在一起,宣布了這條令人興奮的消息.

　　9. The liquid is found in a highly concentrated form.

　　人們發(fā)現(xiàn)這種液體呈高度濃縮狀.

　　10. He concentrated his attention on the question of technology.

　　他將注意力全都貫注在技術(shù)問(wèn)題上.

　　11. They concentrated on better definition of the optical image.

　　他們致力于提高該光學(xué)影像的清晰度.

　　12. She turned the nozzle and the spray concentrated down to a stream.

　　她掉轉(zhuǎn)噴嘴,讓水花集中噴入小河.

　　13. Most of our forces have concentrated at the bridge.

　　我們大部分兵力都已集結(jié)在橋那里.

　　14. Modern industry has been concentrated in a few urban centers.

　　現(xiàn)代工業(yè)全集中在幾個(gè)市中心.

　　15. An enormously powerful fleet was concentrated at Pearl Harbour.

　　一支極其強(qiáng)大的艦隊(duì)集結(jié)在珍珠港.