Quartisternum
胸骨第四節
??? 情景例句
It certainly is. The sun is shining but there's pleasant breeze. It's lovely.
的確不錯。陽光明媚，和風宜人。太舒心了。
When the tree is fallen, every one runs to it with his axe.
大樹一倒下，人人持斧來。
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.
我們必須把很長的鉆桿一節節地鉆入地下，然后再從地下拉出來。鉆桿頂部安裝的發動機帶動鉆桿旋轉，它的底部裝有鉆頭。