Callahan's posit is that each chemical element can radiate a unique signal.
卡拉汉的假定是每种化学元素都能辐射出独特的信号。
Even where this competitive element is absent, however, the performance of difficult feats is agreeable.
即使在不存在竞争因素的情况下, 表演高难的绝技也是件令人惬意的事情.
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