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If you do something obsessively, you think about it or do it all the time, so other things do not get enough room. English often uses this word with a small — it shows : he checks his phone obsessively. You will also hear it as a kind of joke about loving something a lot (I watch that show obsessively), but the core idea is still too much, almost cannot stop. It describes the manner, not a medical label by itself.
著魔似地、過度執著地（帶點不以為然）
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，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。
obsessivelyadv
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In an obsessive manner.
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To an obsessive degree.
- There were moments when I doubted whether it was worth all the effort – whether it was crazy of Anderson to toil so obsessively over three breezy, cheeky vignettes which are neither sidesplittingly hilarious nor heart-wrenchingly insightful.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。