Op. cit.
abbr. 前面引用的书(in the work already quoted)
🗣️ 情景例句
I hear you're expecting a baby, Mrs. Stewart.
我听说你们快有小孩了， Stewart太太。
Long looked for comes at last.
久久寻找，终会找到。
that a series of deep soundings was obtained in the Atlantic and the first samples were collected by dredging the bottom.
才在大西洋测得一个个海水深度，同时通过挖掘海底，取得了研究海底的首批样品。