Go back and listen to the song selection and this time pay attention to the melody and to repetition.

返回，再听一遍选择的歌曲，这次要注意旋律和复唱。

youdao

Now you can go back and add another layer on top of the photo and fix any parts that may cause problems or repetition.

在照片层的上面再添加一层，修复那些可能产生问题的部分。

youdao

At this point, cycle back down to a moderate intensity but change the repetition range and repeat the intensity cycle.

CNN: Should I always lift to muscle failure when weight training?