Ballista: Ancient missile launcher designed to hurl long arrows or heavy Balls.投石机: 古代投掷物体之发射器,用作发射长箭或重型球状物.His favourite gadget is a Russian - made rocket launcher which holds 40 three metre - long missilles.他最喜欢的还是那个俄制...
Soldiers using a multiple rocket launcher scored a direct hit on the steeple of a church.士兵们使用多管火箭筒直接击中一所教堂的尖塔。His favourite gadget is a Russian - made rocket launcher which holds 40 three metre - long missilles.他最喜欢的还是那...
The atmosphere consist of more than 70 % of nitrogen.大气中含有70%以上的氮气.Every tonne of coal contains, on average, 30 kilograms of nitrogen.每吨煤平均含30公斤氮.The plant requires nitrogen in order to make proteins.植物需要氮以便制造蛋白质....