bottom-dwellersBNC¹⁷³⁹⁹⁵⁺² 基本例句 络底层居民原型bottom-dweller的复数 To know which scenario was correct, the researchers needed to find a transitional form— with characteristics that fall somewhere between bottom-dwellers and the permanently ' rafting' janthinids. 为了研究出哪种猜想是正确的，研究人员需要找到过渡类型，既有底栖蜗牛的特性也有漂浮泡泡蜗牛的特征。 yeeyan