图里的黑色曲线显示了极性反向相连的高音喇叭响应。
The black curve shows the response with the tweeter connected with opposite polarity.
采用红外光电传感器实现检测电机速度和画板上黑色曲线轨迹。
System adopt infrared photosensor measure motor rotation speed and drawing locus by black curve on the palette.
他说话时，他的额头，他的眉毛，他的鼻梁，他的睫毛以及他眼睛的曲线，他嘴唇的侧面，统统被星光勾勒成黑色。
The drop of his forehead, his brow, the slope of his nose, his eyelashes and the curve of his eyes, the plastic profile of his mouth, talking, these are all outlined in black against the stars.
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