| 释义 |
| | | | NOUN | | | | | | a fact or piece of information that you need in order to have complete knowledge of something （完整知识）缺少的一环 | | PHRASE | | - | the missing link
| | an early human being believed to have existed long ago and that was half ape and half human | | （被推定存在于类人猿和人类之间的）过渡动物 | | | | | | |