annual reproductive cycle
... annual life cycle 年生活周期 annual reproductive cycle 年生殖周期 anomalistic tide cycle 近日点潮汐周期 ...
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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。
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.
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