The root hair cell wall invaginates at the point of contact.在接触点上,根毛细胞壁内凹.The nuclear membrane invaginates and lysosomes are internalized.核膜内陷,于是溶酶体被内在化....

invaginates的音标：...

v.收进鞘中，套进内部（invaginate的第三人称单数形式）...