繁琐的文字推导和数字计算方法，未作说明。
Laborious derivations and the method and procedure of numerical calculations are understood.
不具备商品应当具备的使用性能而出售时未作说明的；
where a commodity does not possess functions it should possess, and this is not stated when the commodity is sold;
有毒液体，遇水释放可燃性气体，未作说明(吸入危害带a)。
Poisonous liquid, which in contact with water emits flammable gases, n. O. S. (Inhalation Hazard Zone a).
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