When the seed germinates, the hypocotyl appears firstly and swells around the end of it, and some hairs (hypocolyl hair) arise from the swelling.是什么意思_When the seed germinates, the hypocotyl appears firstly and swells around the end of it, and some hairs (hypocolyl hair) arise from the swelling.在线翻译_英语_读音_用法_例句