鱼眼：没有已知用途，除了在摄影教科书中演示效果。
Fisheye: no known USES, except to illustrate fisheye effects in photo how-to books.
不过，声明没有已知的臭氧医疗用途是什么精神病短十足。
However, stating ozone has no known medical USES is nothing short of sheer lunacy.
由于钫主要仅在实验室研究中产生，它在实验室外没有已知的用途。
Because Francium is mainly only found synthetically in laboratory research, it has no known use outside of the laboratory.
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