硅酸鹽礦物的特點是耐熔和難以分離。

有什么保障它不會輕易出故障？

這體系最終是穩(wěn)定的，所以它沒有瓦解。

人為的種族差別也就會消除。

如果陀螺儀發(fā)生故障，天體導航系統就會接替它繼續(xù)進行工作。

break down (a) cease to function because of a mechanical, electrical, etc fault （因機械、電力等故障）停止運轉, 失靈, 失效 The telephone system has broken down. 電話系統失靈了. We (ie Our car) broke down on the motorway. 我們（的汽車）在高速公路上拋錨了. (b) fail; collapse 失敗; 崩潰; 瓦解; 垮 Negotiations between the two sides have broken down. 雙方談判已經破裂. If law and order break down, anarchy will result. 法治一垮, 就會出現無政府狀態(tài). (c) (of sb's health) become very bad; collapse （指某人健康狀況）變得惡劣; 垮 Her health broke down under the pressure of work. 工作的壓力把她的身體弄垮了. (d) lose control of one's feelings 感情失去控制 He broke down and wept when he heard the news. 他聽到這個消息時不禁痛哭起來. break (sth) down (esp of money spent) be divided or divide into parts by analysis （尤指金錢花費）分成幾部分, 細分 Expenditure on the project breaks down as follows wages 10m, plant 4m, raw materials 5m. 該工程費用開支可分成如下幾部分 工資一千萬英鎊, 廠房設備四百萬英鎊, 原料五百萬英鎊. break sth down (a) make sth collapse by striking it hard 猛擊某物使之毀壞 Firemen had to break the door down to reach the people trapped inside. 消防人員須破門而入, 才能搶救困在屋里的人. (b) cause sth to collapse; overcome, conquer or destroy sth 使某事物瓦解; 鎮(zhèn)壓、克服、破壞某事物 break down resistance, opposition, etc 鎮(zhèn)壓抵抗、反抗等 break down sb's reserve, shyness, etc 克服某人的沉默、羞怯等心態(tài) How can we break down the barriers of fear and hostility which divide the two communities? 怎樣才能消除這兩地區(qū)人民之間的恐懼和仇恨呢? (c) change the chemical composition of sth 改變某物的化學成分 Sugar and starch are broken down in the stomach. 糖和淀粉在胃里被分解.