老成的英文：
experienced
trained

参考例句：

Dignified and experienced
持重老成

Proud of her newly-acquired sophistication
她因最近学得老成而自豪

He asked in a sharp, hard little voice-a voice immature, and yet, somehow not young.
他用尖细刺耳的声音轻轻问道——这声音既有些稚气，又有几分老成。

I could match my cousin jasper's game-cock maturity with a sturdier fowl
我可以象斗鸡一样，用一只更强壮的种鸡斗败我堂兄的公鸡，斗败他的世故老成。

experienced是什么意思：
adj. 有经验的，经验丰富的；老练的，有见识的

Popular art is experiencing a renaissance.
通俗艺术正在复兴。

She is shrewd, capable, and experienced.
她精明干练。

He is so experienced in the construction trade.
他在建筑这一行经验丰富。

The management manned the ship with experienced hands.
管理部门给这条船配置了有经验的人员。

The experienced and accomplished person has passed away
老成凋谢

trained是什么意思：
n. 火车；行列；顺序；后果；裙裾
v. 训练，锻炼，培养；修剪；瞄准；拖曳；乘火车

the tail of a train
火车的尾部

explosive train
火药系

Is this dog trained?
这狗受过排便训练吗？

The train was in motion.
火车开动了。

This is a passenger train.
这是辆客运列车。