secondary signal face 辅助交通信号灯面
primary signal face 主要信号灯面
face signal [矿业] 回采工作面信号
signal about-face 信号变换
face of gear signal 回采工作面信号
gate about-face off signal 闸极封闭讯号
He turns and gives a signal nod to another inmate. The inmate moves towards a C.O. overseeing the line-up and punches him in the face.
他转过脸来，对另一个囚犯点头示意了一下，那个囚犯扑向了监督排队的狱警，当头给他一拳。
Researchers believe this chemical signal may also play a role in how other body parts, like the kidneys, eyes, ears, nose, and face, develop.
研究人员相信这种化学信号可能也在身体其它部分像肾，眼睛，耳朵，鼻子和脸上怎样发育起了重要作用。
He pulls a black hood over Lincoln's face and gives the signal to two C.O.S who pull the control switch.
他拉下一块黑色面罩遮住Lincoln的脸，示意另两个狱警拉下开关。
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