你可能想知道在写任何实际的内容之前，为什么我们担心与asdi一起检查TOC。
You may wonder why we bothered to review the TOC with ASDI before writing any of the actual content.
在我继续讲解之前，让我先回答您可能提出的问题：我们为什么要担心往返？
Before I proceed, let me answer a question you might be asking: why do we care about roundtripping?
不像数学，在科学里我们不能有绝对的肯定。但是在日常生活中，我肯定不会担心手机会给我的健康带来什么威胁。
In science, unlike math, we can't have absolute certainty, but in the scheme of things, this is not a health risk I would be concerned about at all.
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