请把这两个句子的位置调换一下。

Please ___transpose the positions of these two sentences.

为了让合唱更容易演唱，指挥把歌曲移调到了更低的音阶。

To make the choir's singing easier, the conductor ___transposed the song to a lower key.

你可以把这个数学公式从直角坐标系转换到极坐标系。

You can ___transpose this mathematical formula from Cartesian to polar coordinates.