With the caveat that almost every figure in this survey is suspect, it can at least be said that the world travel and tourism industry is huge.尽管有人告诫说, 这一调查中几乎每项数字均存有疑问, 但至少可以说世界旅游观光业规模巨大。

The usual caveats about individual case histories must be borne in mind here.在此必须牢记有关个人病历的一般性警告。

And there are caveats: apparently one should never eat any insect if one is allergic to shrimp, shellfish, dust or chocolate.警告如下：对虾、贝类、灰尘或巧克力过敏者绝不可以食用任何昆虫。