The reproductive cycle and temporal characteristics of flower development for the female and male inflorescences of 20 to 30_year_old Betula platyphylla in northeastern China were studied.
以20~30年生白桦的雌雄花序为材料，研究东北地区白桦花发育的生殖周期和发育时序特征。
Male-female worm pairing of schistosome, one special biological phenomenon of the life cycle, is of vital significance to its reproductive function.
雌雄合抱作为血吸虫发育过程中的一种特殊生物学现象，对血吸虫个体的发育成熟，特别是生殖功能的完善有着非常重要的意义。
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