b) 在批准文书时宣布保留意见，就不会分不清哪些缔约国适用文书的全部条文，哪些国家对文书适用于第 4.2.1 条中提到的内陆运输有保留意见。
b) By declaring their reservation at the time of ratification, there could be no confusion as to which contracting States apply all provisions of the instrument and which States reserved on the application of the instrument to inland carriage under Article 4.2.1.