当然这里的产品缺陷是指产品交付给买受人时就存在的，经过一定的时间后要证

当然这里的产品缺陷是指产品交付给买受人时就存在的，经过一定的时间后要证明这一点是比较困难的，买受人自己的操作不当或其他非出卖人原因造成标的物产生了一定的缺陷，不能归责于出卖人。

Results (English) 1:

Product defect here refers to the delivery of the product to the buyer when, after a certain amount of time to prove that this is rather difficult, buyers own improper operation or other non-subject matter caused by the seller produced certain defects cannot be attributed to the seller.

Results (English) 2:

Of course, product defects here means when the product is delivered to the buyer existed, after a certain period of time to prove it is more difficult, the buyer own improper operation or other non-seller causes the subject matter generated certain defects not attributable to the seller.

Results (English) 3:

Of course, where the product defect is to present products are delivered to the buyer, after after a certain period of time to prove this is more difficult, bought by his improper or other non sell reasons cause some defects in the subject matter is produced, not attributable to the seller.