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Fundamentally means “in every way that is basic and important.” If two plans are fundamentally different, they are not just a little unlike — the deep idea under them is not the same. People use it to say: this is true at the root, not only on the surface. You hear it in serious talk, and also in everyday speech when someone wants to sound sure: “I fundamentally disagree.” Though actually, some speakers throw it in as a louder basically, and then it is weaker than it sounds. The core use is still about the base, not the small details.
根本上（不是口語裡隨口的「基本上」——那個比較像 basically。）
組成from fundamental + -ly (in that manner)
同家族的字
- fundamentalthe adjective: basic, at the root
- fundamentalsthe noun, usually plural: the base ideas or skills
原始詞典資料1 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。
fundamentallyadv
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In a fundamental or basic sense; reaching the very core of the matter.
- What the science shows, he says, is that the brain of an addict is fundamentally different from that of a nonaddict.
- Hanks is known as being an avid reader of history and biography, and seems to seek out stories which offer a certain optimism and humanism. In other words, he plays – fundamentally – good people.
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。