unsurmountable

1. He sees some concrete barriers today for Web technologies such as access to on board features and performance but they are not unsurmountable.
   他指出Web技术当前存在若干实质障碍，如性能和访问内置硬件功能的方面，但并非不可克服。
2. In the field of launch weapons, there are some unsurmountable limits in velocity and cost for the traditional launch technologies using chemical energy. Thus, it's a great improvement to apply electromagnetic energy in the launch technology.
   在发射武器领域里，利用化学能的传统发射技术在速度和成本方面存在一些无法逾越的极限，而将电磁能用于发射成为发射技术的一个飞跃。

adj

1. incapable of being surmounted or climbed

   Synonym:    unclimbable

2. not capable of being surmounted or overcome
   1. insurmountable disadvantages

   Synonym:    insurmountable