美国的细菌数量上限是每毫升水不超过500个菌落形成单位。
The U.S. bacterial limit is no more than 500 colony-forming units of bacteria per milliliter of water.
一个暂时的数量上限已经在7月份生效，永久性的会在明年通过。
An interim cap on their Numbers was imposed in July; a permanent one will be adopted next year.
然而，这些投送装备数量上限的限制可能会在接下来三个月的对话中成为主要的症结之一。
However, the top limit for the number of such delivery systems may be one of the main sticking points in the next three months of talks.
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