坚牢地

例句：

1. 1. The old house was built in a stout manner.
   这座老房子建造得非常坚固。
2. 2. He firmly believed that the plan would succeed.
   他坚定地相信这个计划会成功。
3. 3. The new road is securely connected to the main highway.
   这条新路与主干道安全连接。