perish /ˈperɪʃ/ v. 死亡〔尤指惨死或猝死〕;点击音频收听跟读 ↓↓↓↓↓↓（网络问题不显示请关闭头条app后台重新打开）例句/词组:Hundreds perished when the ship went down. 轮船沉没，数百人罹难。
virtually/largelyunknown, elusive, unclear, much less explored, surprisingly limited, less understood, unsolved, scarcely understood2、如果是研究某
