说到风筝的使用目的和功能，它们当然有多种用途。
Turning to the purpose and function of the kites, they certainly had multiple uses.
然而需要注意的是，我们使用了AND而不是OR：这是有目的。
Note, however, that we use the AND conjunction instead of OR: this is intentional.
对使用较多的有目的抽样则阐述较少。
Little has been said about purpose sampling which is used much more in practice.
对使用较多的有目的抽样则阐述较少。
Little has been said about purpose sampling which is used much more in practice.
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