你觉得哪种泳姿最容易学？

Which ___stroke do you find the easiest to learn?

她的教练强调了掌握正确泳姿的重要性。

Her coach emphasized the importance of mastering proper ___strokes.

混合泳接力要求每位运动员使用不同的泳姿。

The medley relay requires each swimmer to use a different ___stroke.