稳健的英文：
firm
stable and steady

参考例句：

Moderate in speech
谈吐稳健

Settle into a fast,confident and steady pace(of doing sth)
开始加快速度、充满信心并稳健地(做某事)

Play the piano with a light,heavy,firm,delicate,etc touch
以轻快的、有力的、稳健的、灵巧的...指法弹钢琴

Moving with the assured poise of a ballet dancer
带有芭蕾舞演员那种稳健姿势的动作.

The horse started off at a steady trot.
那匹马快步稳健地跑了起来.

surefooted, they leap easily from rock to rock and climb seemingly sheer cliffs
他们脚步稳健，能轻松地跳跃于岩石间，攀登陡峭的悬崖。

A steady and firm attitude
稳健态度

Conservatism Principle
稳健性原则

He is a person who is politically moderate.
他在政治上很稳健。

He proved to be sure-footed and reliable.
事实证明他稳健可靠。

firm是什么意思：
n. 商号；企业
adj. 坚定的；坚固的；强有力的；确定的；坚挺的；严格的
v. （使）坚固；变坚实；加强；使坚定；回升
adv. 坚定地

Are the firm's finances sound?
这家公司的财务状况可靠吗?

His step was not as sharp and firm.
他的脚步不再像从前那样敏捷、坚实。

To become firm or gelatinous; congeal.
凝固凝结或变硬；冻结

stable是什么意思：
n. 厩；马厩；属同一马主的赛马；训练处；课堂；破屋，陋室
adj. 稳定的；固定的；不动摇的

The horse stable is in the main barn,the cow stable is separate.
马厩在大牲口棚里，牛栏则分开在另外一个地方。

stable electron orbit
稳定电子轨道

The horse in the stable has broken out.
马厩里的那匹马跑了。

steady是什么意思：
adj. 稳定的，不变的；镇定的
v. 恢复平稳；使稳定，使坚定

The boat soon steadied again.
那船很快又稳定了下来。

Danger steadies some people.
有的人在危险时候反而坚定。

The flow of fluid is steady.
液体的流动很稳定。