where do you ofter see the sign "THIS SIDE UP"?l think it's（ ）（ ）写什么?

where do you ofter see the sign "THIS SIDE UP"?l think it's（ ）（ ）写什么?
where do you ofter see the sign "THIS SIDE UP"?l think it's（ ）
（ ）写什么?

where do you ofter see the sign "THIS SIDE UP"?l think it's（ ）（ ）写什么?
this side up
表示这面朝上
一般用于外包装
i think it's often seen from external packing.
我想这个经常会在外包装上看到