在竞技游泳中，自由泳（爬泳）通常是最快的泳姿。

In competitive swimming, the front ___crawl is often the fastest stroke.

她已经掌握了蛙泳和自由泳，但在仰泳上仍有困难。

She has mastered both breaststroke and ___crawl, but still struggles with backstroke.

要完善你的自由泳，你需要协调手臂动作和稳定的腿部踢水。

To perfect your ___crawl, you need to coordinate your arm movements with a steady leg kick.