灯塔的光束在渐浓的暮色中清晰可见。The lighthouse beam was quite distinct in the gathering dusk.他们驱车返回华灯初上的希灵汉姆时，暮色渐浓。Dusk was deepening as they drove back to the lights of Shillingham.暮色渐浓，变成了漆黑一片。The twilight had turned to a deep blackn...
Gaseous helium is inert, colorless, odorless, non corrosive, and nonflammable.气态氦极不活泼, 无色, 无嗅, 无腐蚀性, 不可燃.The application of gaseous ozone as ( biocide ) is a questionable practice.温室中使用臭氧气体防治病虫害是个错误.The rate of chlorosul...