四端是指儒家称应有的四种德行，即：恻隐之心，仁之端也；羞恶之心，义之端也；辞让之心，礼之端也；是非之心，智之端也。 “四端”说是孟子思想的一个重要内容，也是孟子对先秦儒学理论的一个重要贡献。
四端床柱在上方形成一个架子，并铺上和床罩同样的锦缎。
The four posters of the bed form the frame for the canopy, laid with the same brocade as the bedding.
控温电路采用四端电阻自平衡电流环路，从而保证其电气和温度均处于闭环状态。
The control circuit is a self-balancing current loop which makes use of a four-terminal resistor of nickel wire to assure a close-loop both electrically and thermally.
依据四端网络的基本原理，利用力电类比的方法，给出了复合变幅杆的等效电路图；
Based on the theory of four-end network, the equivalent electric circuit diagrams of the horn are given by using the analogous method between methanical force and electric.
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