You will be surprised how difficult it is to maintain perfect alignment in this exercise.

知道在这个练习中排列的很整齐有多困难，你会很惊讶的。

youdao

You will be surprised how difficult it is to maintain perfect alignment in this exercise.

知道在这个练习中排列的很整齐有多困难，你会很惊讶的。

youdao