lalala
@chenqjan
在這裡訂購：https://ducon.space/pi-t-shirt-3-1 4 -pi-number-symbol-math-science-gift-t-shirt?twclid=23e56a4wsmzc6wo2ibvlfs5k90 更多資訊在這裡：https :// ducon .space/collection/math ?twclid=23e56a4wsmzc6wo2ibvlfs5k90
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