In species of Pinus which are polycyclic flower initiation must occur over a wide time range.

具有多环球花的松树属种，其花的孕育期会延续较长的时间。

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In species of Pinus which are polycyclic flower initiation must occur over a wide time range.

具有多环球花的松树属种，其花的孕育期会延续较长的时间。

youdao