2. Từ điển
3. Từ vựng theo chủ đề
4. Âm thanh

• brilliance
• definition
• dulcet
• dullness
• fullness
• fulness
• high-pitched
• hollow
• insulating layer
• low
• lowness
• pitch
• plangently
• repercussion
• reverberate
• reverberation
• return
• reverberatory
• sonority
• sonorously
• sonorousness
• tone keyer
• transmission coefficient
• undamped
• veiled
• vibrate