高度的

The solders In the open field were exposed to the enemy's gunfire.

旷野中的士兵们遭到敌人炮火的攻击。

It is very necessary to develop a new kind of digital oscillograph with simple structure, being operated facilely, requesting not high level manufacture technology and low cost.

目前研制一种结构简单、操作方便、生产技术要求不高、费用低的新型数字示波器是非常必要的。