An active element; a word, phrase, or symbol.

有效元件； 一句话，短语或者符号。

Competition mechanism is the most active element of market economy.

竞争机制是市场经济中最活跃的要素.

It goes without saying that oxygen is the most active element in the atmosphere.

不言而喻，氧气是大气中最活泼的元素。

That air brake isn't the only active element of the Veyron's aerodynamics, either.

空气制动并非是唯一的活性元素的威龙的空气动力学果子吃。

I think the methodology is aimed at making the pupil an active element in the classroom.

我想，这一套方法的目的在于让小学生成为课堂上的活跃元素。

Moment method is used to calculate the element current and scattered field, and we define this scattered field as the Active Element Scattering Pattern (AESP).

进而由矩量法得到单个阵元上的电流分布和散射场，并定义为单元的特征散射方向图。