Dirt2 一些成就求解？？？

笑问·苍天

Gnarly! 15G
Finish with Flair! Cross the finish line with no more than two wheels touching the ground.


On The Bubble 15G
Be second to last at each elimination point but go on to win a Last Man Standing race.

You're The Best, Around! 20G
Win a race at every track in the game (in any game mode).


Gate Crashed! 10G
Hit every gate in a Gatecrasher event.


Piece Of Cake 10G
Win a Throwdown.
Throwdown. 是什么比赛？ 貌似还有在这个比赛中打败相关的人,请教？？

请教已经解除的大大答疑解惑.