5个以acle为后缀的单词

　　例句：

　　Overcrowding remains a large obstacle to improving conditions.

　　过度拥挤仍然是改善条件的一大障碍。

　　A lack of qualifications can be a major obstacle to finding a job.

　　学历不足可能成为谋职的主要障碍。

　　She is an adept rock-climber and a past master of the obstacle course.

　　她擅长攀岩，也是障碍超越训练场上的老手。

　　The falls have always been an insurmountable obstacle for salmon and sea trout.

　　这些瀑布始终是鲑鱼和海鳟鱼不可逾越的障碍。