fragility

例句：

1. 1. The fragile ecosystem is at risk of collapse due to human activities.
   脆弱的生态系统因人类活动而面临崩溃的风险。
2. 2.The old building was built in the 19th century and has many historical fragility features.
   这座老建筑建于19世纪，有许多历史脆弱特征。
3. 3.The fragile relationship between the two countries needs to be carefully managed.
   这两个国家之间的关系需要小心管理。