演化這條鍊子上找不到的那一截
還是同一條鍊子，只是這一次鍊子是「從猿到人」的先後順序，缺的那一環是一種沒被挖出來的動物。
noun · C1
The missing link: an animal that people once expected to find between apes and humans in the story of how humans developed, and whose bones have not been found.
演化上缺的那一環
核心畫面
A link is one ring of a chain. Picture a chain laid out on a table with every ring hooked to the next, except in one place: there the chain simply stops and starts again, and the two halves cannot pull on each other. Nothing is wrong with the rings you have. The whole problem is the one that is absent. Every use of missing link is that gap — in what you know, in what connects two places or two people, or in a line of animals running from apes to us.
link 是鍊子上的一環。可以想成一條鍊子攤在桌上，每一環都扣著下一環，只有一個地方例外：鍊子在那裡斷開，兩半使不上…更多收起
link 是鍊子上的一環。可以想成一條鍊子攤在桌上，每一環都扣著下一環，只有一個地方例外：鍊子在那裡斷開，兩半使不上力。手上有的那些環都沒問題，問題全在那個不在的環。missing link 的每一個用法都是這個缺口：你知道的事情裡缺一塊、兩個地方或兩個人之間缺一段連接，或是從猿到人的那條隊伍裡缺了一截。From the picture
Also in this word
noun · B2
The one piece of information that is still missing, and that you need before you can finish working something out.
缺的那一塊線索
noun · B2
A person or thing that would join two separate groups, ideas, or parts of a system together — the connection people are looking for but do not have yet.
居中的那一環