完全密封的环境

totally sealed environment

• mosque
• mosquito
• moss
• most
• mostly
• motel
• mother
• motherland
• motion
• motivate
• motivation
• motive
• motor
• motorbike
• motorcycle
• motorway
• motto
• mould
• mount
• mountain
• mountainous
• mourn
• mournful
• mouse
• moustache