internal cork

例句：

1. 1. The wine bottle has a built-in cork to keep the contents fresh.
   这个酒瓶有一个内置的塞子，用来保持酒的新鲜。
2. 2. The chefused an inner plug toseal the jar before adding theingredients.
   厨师用一个内塞子密封了罐子，然后才加入食材。
3. 3.The inner plug prevents air from gettinginto the container during transportation.
   这个内塞子在运输过程中防止空气进入容器。