Spouts can be hollow.Logical formLearned from1 sentences. An (ivory ornament) can be hollow.Logical formLearned from1 sentences. A (murmur underground) can be hollow.Logical formLearned from1 sentences. A penumbra can be hollow.Logical formLearned from1 sentences. Knuckles may sound hollow.Logical formLearned from1 sentences. A (scraping sound) can be hollow.Logical formLearned from1 sentences. Gentlemen can be hollow.Logical formLearned from1 sentences. A merriment can be hollow.Logical formLearned from1 sentences. A bargain can be hollow.Logical formLearned from1 sentences. A desk can be hollow.Logical formLearned from1 sentences. A window-seat can be hollow.Logical formLearned from1 sentences. A hearth can be hollow.Logical formLearned from1 sentences. A pitfall can be hollow.Logical formLearned from1 sentences. An accompaniment can be hollow.Logical formLearned from1 sentences. Shrines can be hollow.Logical formLearned from1 sentences.