繁重的任务来源：考试学习网的英文

heavy task

• 繁重:    heavy; strenuous; ...
• 的:    4次方是 The fourth po ...
• 任务:    task; job
• 来源:    source; origin
• 考试:    examination; test; ...
• 学习:    study; learn; emul ...
• 网:    net