牢牢的英文：
firmly

参考例句：

The prisoner's hands were securely tied.
那犯人的双手给牢牢捆住了.

embed a post in concrete;fossils embedded in shale.
把柱子嵌在水泥中；牢牢嵌在页岩中的化石。

Truth was the one virtue, which I might have held fast, and did hold fast, through all extremity;
诚实是我可以仅守的美德，而且不管有什么艰难险阻，我也确实牢牢守住了这一美德；

to stick fast
牢牢粘住

To grasp steadfastly
牢牢把握

He held hard on to the rope.
他牢牢抓着绳子。

The president keeps a firm grip on his country's foreign policy.
总统牢牢控制着国家的外交政策。

We must take firm hold the key link of our work.
我们要牢牢抓住工作的主要环节。

The sentence patterns were thoroughly drilled in
通过反复练习，这些句型被牢牢掌握了。

These facts lie embedded in his mind.
这些事实牢牢铭记在他的心中。

firmly是什么意思：
adv. 坚固地；稳固地；坚定地；坚决地

Grasp the thistle firmly
毅然处理困难局面

The struts are firmly braced.
那些支柱上得很牢固。

The tables are firmly fixed to the floor.
这些桌子被牢牢地固定在地上。

She knotted the parcel firmly.
她把那个小包扎得很紧。

v. to secure or fix something firmly
使某物牢固