Our supplier ships purified soot in sealed drums to the ink factory every month.

我們的供應商每個月都會將純化碳黑裝在密封桶裡運到墨水工廠。

The paint manufacturer's invoice listed soot as the most expensive raw material this quarter.

油漆製造商的發票列出碳黑是本季最昂貴的原料。

During the plant tour, the manager explained how soot gives our printing ink its deep color.

參觀工廠時，經理說明了碳黑如何讓我們的印刷墨水呈現深濃色澤。