1. The science of the use of guns; gunnery. 
   炮兵射击术使用枪炮的方法；枪炮操作
2. Accurate gunnery had already put three of the leading tanks out of action. 
   准确的炮火已击毁带头的3辆坦克车。
3. no trial without complaint 
   不告不理
4. principle of direct trial 
   直接原则
5. principle of uninterrupted trial 
   不间断原则

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• 1. 枪炮试放
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