And there in lies the second concern: We have to be wary of what constitutes "critical infrastructure".

除此之外还有第二点：我们必须谨慎地对待所谓“关键基础设施”的构成。

youdao

But Art Cashin says Wall Street remains wary. "The concern down here is it may intimidate some of the financial institutions, and therefore make credit less available and less likely and hurt the recovery."

VOA: standard.2010.05.21

Bills or letters from acquaintances aren't necessarily cause for concern, but be wary of mail you don't ordinarily get, or from someone you don't know, Koplan said.

CNN: Bush, postal officials urge caution with mail