intumescentia

例句：

1. 1.The balloon inflated quickly when it hit the water.
   当气球碰到水时，它迅速膨胀。
2. 2.The car's engine is expanding as it warms up.
   随着汽车变热，它的引擎正在膨胀。
3. 3.The dough was expanding into a soft ball.
   面团正膨胀成一个软球。