瀝青(v.n.U)/Tar/asphalt(v.n.U)：
Tar is a black substance used for road paving.
They just have the roads asphalted last week.
Additional note: Tar/焦油 is also a substance that can be found in tobacco.
On my mind:
I have come across the word "tar" before but this is the first time I meet "asphalt". There is so much to be learnt about chemistry.
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