Macadam is a road surface made of broken stones mixed with tar or asphalt and packed hard so cars can run on it. It is named after a Scottish engineer, John Loudon McAdam (1756–1836), who invented a way of building roads from layers of small stones.

Macadam Macadam is是 a road surface made of broken stones mixed with tar or asphalt一種用碎石混合柏油或瀝青做成的路面，and而 packed hard so cars can run on it再壓實到車子可以在上面跑。It它 is named after a Scottish engineer, John Loudon McAdam (1756–1836)是以一位蘇格蘭工程師John Loudon McAdam（1756–1836）的名字命名的，who invented a way of building roads from layers of small stones他發明了一種用一層層小石子鋪路的方法。

His first roads did not use tar; later people added tar, and the name stayed.

His first roads他最早的路面 did not use tar並沒有用柏油；later後來 people added tar人們加上了柏油，and而 the name stayed名字沿用了下來。

Today speakers sometimes use macadam for any black stone-and-tar street, or even loosely for “the road” itself, which is a bit stretched. You will see the word in older books, in engineering, and in talk about streets more than in daily chat — most people now say the road or, in Britain, tarmac.

Today speakers sometimes現在有些人有時候會 use macadam for any black stone-and-tar street把macadam用來泛指任何黑色石子加柏油的街道，or even loosely for "the road" itself甚至鬆散地拿來指「馬路」本身，which is a bit stretched這算是用得有點延伸過頭。You will see the word你會看到這個字 in older books, in engineering, and in talk about streets在比較舊的書裡、工程領域、還有談論街道的場合 more than in daily chat比在日常聊天裡更常見──most people now say the road or, in Britain, tarmac現在大部分人會說the road，或者在英國會說tarmac。

There is also a verb, to macadam a road, meaning to put that surface on it, but that verb is uncommon now.

There is also a verb也有一個動詞用法，to macadam a road「to macadam a road」，meaning to put that surface on it意思是把那種路面鋪上去，but that verb is uncommon now但這個動詞現在不常見。