He won two gold MEDALS in the Australian crawl.

他在澳大利亚式爬泳大赛中夺得了两枚金牌。

Usually, people choose the Australian crawl, which is the fastest.

通常人们会选择澳大利亚爬泳，因为它是最快的。

Crawl: a stroke made in the prone position characterized by alternate over arm movements and a continuous up-and-down kick; originally known as the Australian crawl.

即采用俯卧姿势，以双臂连续轮流划水、双腿上下连续打水为特点，最初通称为澳大利亚爬泳。