胚乳发育为核型，珠孔端胚乳细胞化，合点端保持游离核状态。
The endosperm development follows the nuclear type. The endosperm cells form at the micropylar end, and remain free nuclear phase at chalazal end.
开花前 ，两极核融合成次生核 ，或不融合仍保留极核状态。
Two polar nucleis fuse into the secondary nucleus, or they dontt fuse before the anther shed.
研究了铝合金点焊过程中声音信号的时频域能量分布，并应用它来识别点焊的熔核状态。
This paper investigates energy distribution of air-borne acoustic signals in time-frequency domain during aluminum alloys spot welding in order to identify weld nugget states.
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