1.Identify a subject you find challenging, such as mathematics, physics, etc. 2.Explain why you find this subject challenging, considering factors like complexity, workload, or personal interest.

1. 找到一个你觉得有挑战性的学科，例如数学、物理等。 2. 解释为什么你觉得这个学科具有挑战性，考虑复杂性、工作量或个人兴趣等因素。