cross-pollination
noun [ U ] biology specialized uk/ˈkrɒsˌpɒl.əˈneɪ.ʃən/ us/ˈkrɑːsˌpɑːl.əˈneɪ.ʃən/
异花受粉
the process by which pollen (= powder produced by the male part of a flower) is carried from one flower to another by wind, insects, etc.