脆弱性

例句：

1. 1. The new building is very fragile and needs to be reinforced.
   这座新建筑非常脆弱，需要加固。
2. 2. The old tree was fragile and needed to be replaced.
   那棵老树很脆弱，需要被替换。
3. 3. The economy is vulnerable to sudden changes in the global market.
   经济对全球市场突然变化非常脆弱。