课题

❶topic (or question) for study or discussion
❷problem; task; challenge
这么多的国家如何才能做到友好合作、和睦相处，是历史向我们提出的重大～。An important historical question is:how can these countries conduct friendly cooperation and live in harmony?/和平与发展是当前世界的两大～。Peace and development are two major issues in the world today./提出新的～pose a new problem;set a new task/研究～research topic