Kayakers , Alaska. 皮划艇 ，阿拉斯加。

Ron Barta / AP

Ron Barta / AP
Kayakers ride tidal bore wave as it surges into Alaska's Turnagain Arm - PhotoBlog http://photoblog.msnbc.msn.com/_news/2012/06/06/12091111-kayakers-ride-tidal-bore-wave-as-it-surges-into-alaskas-turnagain-arm?lite