黑线

hóng xiàn hé hēi xiàn kě yǐ bāng zhù shí bié jù tǐ de diàn lù

红线和黑线可以帮助识别具体的电路。

Red and black wires could enable identification of specific circuits.

dāng hēi xiàn duàn kāi tā yīng shěn shì zhěng kuài zhī bù bìng jiǎn chá jī zhù

当黑线断开，他应审视整块织布，并检查机杼。

When the black thread breaks, he shall look into the whole cloth, and shall examine the loom.

jǐng chá fā xiàn le xiāo shòu dào bǎn guāng pán de hēi xiàn

警察发现了销售盗版光盘的黑线。

The police found black thread of selling pirated compact disks.