That does happen in medicine: new treatments for cardiovascular patients and for babies of low birth-weight have delivered benefits far outweighing their costs.
The shortage in net weight of delivered cargo was due to insufficiency of originally dispatched weight.
到货净重短少，系原发货重量不足所致。
3
Article 32 When a mail item is delivered to the addressee or returned to the sender, it shall not be deemed damaged should there neither be loss of weight nor visible surface damage.