任何有能力做到这一点的物质都不是完全安全的。
No substance that has the power to do this is completely safe.
现在我知道，对一些人来说，这做起来可能是一件相当可怕的事情，但它是完全安全的。
Now I know that for some people this might be quite a frightening thing to do, but it is perfectly safe.
不管怎样，这些带子是完全安全的，一些蜂鸟已经戴上这些带子很多年了，没有出现任何问题。
Anyway, these bands are perfectly safe, and some humming birds have worn them for years with no evidence of any problems.
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