all pallets are packed up high on....."high on"?? - 翻譯

請問這句

all pallets are packed up high on and are not stockable.

是什麼意思呢?

HIGH ON該在此句中作何解釋為佳?

熱衷?過高?

整句為"所有棧板的包裝過高且無法現在取得"

我翻成降,但我看不懂它的意思...因為我不會翻 T_T



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