Nitrocompound
硝基化合物
🗣️ 情景例句
What classes are mandatory for your major?
你的专业什么课是必修的？
Love is the touchstone of virtue.
爱情是美德的试金石。
Heavy iron chains around his feet and hands were fixed to a metal bar that ran round the hall about ten centimetres off the ground.
手上和脚上沉重的铁链拴在厅堂四周离地约有10厘米的金属杆上。