noun🔗Share开口销，键。 A pin or wedge inserted through a slot to hold machine parts together."The mechanic replaced the cotter on the bicycle wheel axle to keep the wheel from coming loose. "那个机械师更换了自行车轮轴上的开口销，以防止轮子松动脱落。machinetechnicalpartdeviceChat with AIVocabulary GamePractice Reading
noun🔗Share开口销，开口梢。 A cotter pin."He used pliers to remove the cotter holding the wheel on the toy wagon. "他用钳子拔掉了固定玩具车轮子的开口销。machinetechnicalpartChat with AIVocabulary GamePractice Reading
verb🔗Share用开口销固定，用键固定 To fasten with a cotter."The mechanic had to cotter the wheel hub to the axle to secure it properly. "为了确保稳固，机械师不得不用开口销把轮毂固定在车轴上。technicaltechnologyutilityChat with AIVocabulary GamePractice Reading
noun🔗Share佃农，茅舍农。 A peasant who performed labour in exchange for the right to live in a cottage."The cotter worked the lord's fields from dawn till dusk, earning the right to live in a small cottage with his family. "那个佃农从早到晚都在为地主耕田，以此换取和家人住在小茅舍里的权利。personjobhistoryagriculturesocietyChat with AIVocabulary GamePractice Reading
