- 1承擔、著手進行（undertake 的過去式）。
This is the past tense of "undertake." To undertake something means to start doing a job or task, especially one that is big, serious, or difficult - like a project, a study, or a journey. It can also mean to formally promise to do something. "Undertook" is just the "did it" version, for something that already happened.
組成Under + took (past tense of take) - a very old combination, and the exact history of why is a bit fuzzy.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
這個拼法也被記錄為下列字的變化形：
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。