Warning: file_put_contents(): Only 0 of 4849 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/28094.com/index.php on line 55 embryo sac英英字典_embryo sac剑桥英语解释_embryo sac柯林斯英文解释_贰靶汉英词典
1. N the structure within a plant ovule that contains the egg cell: develops from the megaspore and contains the embryo plant and endosperm after fertilization 胚囊