Externalfertilization occurs when gametes are expelled into a watery substrate from the parental bodies before fusion; it is typical of spore bearing plants.
当配子在融合之前从亲本体中排出到有水介质时发生体外受精，这是孢子植物的特征。
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This paper introduced the methods. problems and the present situation at home and abroad about spermatophore obtainment, spermatophore implantation and artificial externalfertilization in shrimp.