20.26 研讨会、讲习班和培训活动方面出现差异的主要原因是，由于《远距离越境空气污染公约》缔约方提出了请求，以及 2018 年底获得了预算外资源，因此举办了更多讲习班。
20.26 The variance in seminars, workshops and training events was driven mainly by additional workshops, owing to requests from parties to the Convention on Long-range Transboundary Air Pollution and the availability of extrabudgetary resources at the end of 2018.