Overhead, the lights showed the old timbers, used to brace the roof.灯光照亮了头顶上支撑屋顶的旧房梁。My daughter has to wear a brace on her teeth.我的女儿得戴牙套以矫正牙齿。The doctor cautioned him to brace up.医生告诫他要振奋精神.You had better brace yoursel...
In the future the machines will need spare parts and maintenance.这些机器将来会需要备件和维修保养。Other than blowing up a tyre I hadn't done any car maintenance.除了给轮胎充气外，我没做过任何汽车保养。She was a high-maintenance girl who needed lots of...
甲烷起火，致使8人丧生。The ignition of methane gas killed eight men.甲烷和丙烷是烷烃。Methane and propane are alkanes.甲烷常被认为是仅次于二氧化碳的重要温室气体。Methane is often regarded as the second most important greenhouse gas after carbon dioxide....
Then the LORD rained down burning sulfur on Sodom and Gomorrah - from the LORD outthe heavens.当时,耶和华将硫磺与火从天上耶和华那里降与所多玛和蛾摩拉.Is it a lack of sulfur that causes chlorosis?褪绿病是缺硫引起的 吗 ?The devulcanization mechanism of natura...