Every decision should have a contingency plan for when those unknown unknowns arise and deem your primary course of action obsolete.
每一项决策都应该制定一项应对“未知的未知”和主要行动方案失败等情形的应急方案。
The curriculum of track and field is the primary course and the major curriculum of elementary education.
田径课程是体育教育专业的主干课程，同时也是中小学体育教育的必修内容。
The public Psychological Course, which is a primary course to train teachers in teachers colleges, need further improvement in curriculum design, teaching methods and teaching hours.
高师公共课心理学作为培养师资的主干课程，它的课程设计、教学手段、教学时数都有待于进一步的改进。
The public Psychological Course, which is a primary course to train teachers in teachers colleges, need further improvement in curriculum design, teaching methods and teaching hours.
高师公共课心理学作为培养师资的主干课程，它的课程设计、教学手段、教学时数都有待于进一步的改进。
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