hold.fast
n.（名词）Any of various devices used to fasten something securely.紧握之物：用来紧紧扣住东西使其安全的装置Biology An organ or a structure of attachment, especially the basal, rootlike formation by which certain seaweeds or other algae are attached to a substrate.【生物学】 吸盘：吸附的器官或结构，尤指一些海藻或其他藻类植物吸附在上面的基部的类根结构
