词汇	Is this your pen?
释义	Is this your pen? 这是你的笔吗？
随便看	mutual-aid system mutual-aid teaching mutual aid team mutual-aid team mutual assent mutual assimilation mutual assistance Mutual Assistance Advisory Committee Mutual Assistance Alliance of America mutual assistance in disease prevention mutual-assistance network Mutual Assistance on Operational Matters Mutual Assistance Program mutual association mutual assured destruction mutual assured destructionmad mutual assured destruction strategy mutual assured survival mutual assured survival strategy mutual atomic energy reinsurance pool mutual attraction mutual benefit and progress mutual benefit and reciprocity mutual benefit and shared profit mutual benefit and win-win