It doesn't make proper sense to me. Long lengths of what?
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thein lwinused to take various sizes of packs.It's not at all clear what this means. It's confusing. Has this got something to do with delivering packages? Or are you storing something in your home?
thein lwinAn adjustable shelf with long lengthsThis is awkward. You may have to limit yourself to just "An adjustable she
thein lwinAre the phrases 'an adjustable shelf in a short/longth length' meaningful?Common sense tells me that each shelf is of a fixed, short length and that the distance between shelves is adjustable. Is that what you mean to say? The problem seems to be that you speak of only one shelf; do you mean shelving (a set of shelves)?