The leading role in a play or film is the main role. A leading lady or man is an actor who plays this role.
an offer to play the leading role in an Arthur Miller play.
一个在亚瑟·米勒的剧目中出演主角的机会。
The leading group, vehicle, or person in a race or procession is the one that is at the front.
The leading car came to a halt.
行驶在前面的车停了下来。