slow 本身可以作形容词和副词 当然 slowly 也是slow的副词 所以slow的副词是slow和slowly
例如：形容词 adj.
1.慢的
This is the slow lane of a motorway.
这是高速路的慢车道.
2.迟钝的; 不灵巧的,笨的；理解力差的
I'm sorry I'm so slow today,I didn't get much sleep last night.
对不起,我今天反应太迟钝,我昨天晚上没睡多少觉.
副词 adv.
1.慢慢地
The watch runs slow.
表走着走着就慢了.
How slow would you like me to play?
你要我弹奏多慢?