An oratory can be hollow.Logical formLearned from5 sentences. A wish can be hollow.Logical formLearned from5 sentences. A title can be hollow.Logical formLearned from5 sentences. (Bamboo tubes) can be hollow.Logical formLearned from5 sentences. A center can be hollow.Logical formLearned from5 sentences. Drills can be hollow.Logical formLearned from5 sentences. A (stem stage) can be hollow.Logical formLearned from5 sentences. A promise may prove hollow.Logical formLearned from5 sentences. Emotions can be hollow.Logical formLearned from5 sentences. A grave can be hollow.Logical formLearned from5 sentences. Valleys can be hollow.Logical formLearned from5 sentences. A fuselage can be hollow.Logical formLearned from5 sentences. Thuds can be hollow.Logical formLearned from5 sentences. An universe can be hollow.Logical formLearned from5 sentences. A (rubber tube) can be hollow.Logical formLearned from5 sentences.