Definition: something that makes it difficult for you to do something or to succeed at something Level: C1
她设法克服了障碍，按时完成了项目。
She managed to overcome the ___obstacle and complete the project on time.
他拒绝谈话是和平的主要障碍。
His refusal to talk is the main ___obstacle to peace.
学生的另一个障碍是图书馆提前关闭。
Another ___obstacle for students is the early closure of the library.
