Why does the Torricelli Act prevent vessels from the rest of the world from calling at Cuban ports, under the threat of being blacklisted and denied access to American ports for a period of six months?
为什么《托里切利法案》禁止来自世界其他地区的船只进入古巴的港口，威胁要将其列入黑名单并禁止其在六月内进入美国港口？