天一牌 is the brand name of this pure 纯[chún] milk.
This is a UPH 高温灭菌处理[gāowēnmièjūnchǔlǐ] product 产品[chǎnpǐn].
You can drink 饮用[yǐnyòng] directly 直接[zhíjiē].
Storage 贮存[zhùcún] Method 方法[fāngfǎ]：room temperature 常温[chángwēn]
cool 阴凉[yīnliáng] and dry 干燥[gānzào] preserve 保存[bǎocún]
(but after opening, it must be stored in a fridge 冰箱[bīngxiāng],
quality guaranteed 保质[bǎozhì] for 2 days)
保质期[bǎozhìqī]：best before time period：30 days
生产日期[shēngchǎnrìqī]： production date： on seal 见接口[jiànjiēkǒu]
产品标准号：product standard number
(company name)
Olympic Athletes Endorsed Product
This product has passed International Quality Certification
This carton 盒[hé] of milk cannot be sold after when?
BE CAREFUL! The date on the seal is the production date not the best before date,
so to get the best before date, we need to add 30 days to this date,
so here our answer is D. May 13th
We need to use a process of elimination to
answer this question.
B. means you should heat up 加热[jiārè] the milk to drink it. 
C. You must 得[déi] drink it after opening
D. You must keep it in the fridge also
because before opening you can keep it at room temperature.
So the answer must be A. The quality 质量[zhìliàng] is comparatively reliable 可靠[kěkào].
As we can see it has an ISO number, is UHT, and is an Official Olympic product.