back-flow的例句（back-flow在句子中的用法）

• The flow of current actuates the signal. 电流发出了信号。
• He took up his accustomed position with his back to the fire... 他背对着炉火在通常的位子上坐了下来。
• With one accord they turned and walked back over the grass. 他们步调一致地转身走过草坪。
• He looked back at the abject, silent girl and repeated his question. 他转过头看着这个噤若寒蝉的女孩，又重复了一遍他的问题。