未能达到的用英语可以表示为 "unattainable"。
这个词来源于拉丁文 "attainere"，意思是 "to reach, to arrive at, to achieve"。
例句：
His dream of becoming a famous musician seemed unattainable to him. 他成为著名音乐家的梦想似乎是不可能实现的。
The idea of world peace may seem unattainable, but we can still strive for it. 世界和平的理念可能看起来是不可能实现的，但我们仍然可以为之奋斗。
这个词来源于拉丁文 "attainere"，意思是 "to reach, to arrive at, to achieve"。
例句：
His dream of becoming a famous musician seemed unattainable to him. 他成为著名音乐家的梦想似乎是不可能实现的。
The idea of world peace may seem unattainable, but we can still strive for it. 世界和平的理念可能看起来是不可能实现的，但我们仍然可以为之奋斗。