目前尚不清楚伊朗、苏丹和尼日利亚落选，是由于中国企业已在这3个国家拥有了短期投资计划，还是更多出于政治方面的原因。
It is not clear whether the exclusion of Iran , Sudan and Nigeria came because Chinese companies already have short-term investments plans in the three countries , or for more political reasons .
短期投资计划