All the alternative approaches require some AD hoc steps by users of the trait, which is error prone because they might do it wrong or forget to do it all.
所有的其它方法都需要这个trait的用户的一些特别步骤，这很容易发生错误，因为他们可能会做错甚至忘记去做。
All the alternative approaches require some AD hoc steps by users of the trait, which is error prone because they might do it wrong or forget to do it all.
所有的其它方法都需要这个trait的用户的一些特别步骤，这很容易发生错误，因为他们可能会做错甚至忘记去做。
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