短语词组短语Petiole Sturdy 叶柄粗壮Petiole character 叶柄特征Petiole spot 小黑点病petiole explants 叶柄Petiole Sheathing 叶柄具鞘Petiole length 叶柄长;叶柄长度cotyledon petiole 子叶柄unifacial petiole 单面叶柄secondary petiole [植]小叶柄 返回 petiole