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When something happens perceptibly, you can notice it — even if the change is only a little. The room became perceptibly warmer. Her hands were perceptibly shaking. The word is careful: it does not say the change is big, only that it is there and you can tell. In everyday talk people more often say “.” Though actually, it is also common in the negative: “not perceptibly different” means you can hardly tell the two things apart. You will meet it more in writing than in casual speech.
可察覺地、感覺得到地（程度常很輕，不是「差很多」）
組成perceptible (can be noticed) + -ly (in that way). From perceptible + -ly.
同家族的字
- perceptiblethe adjective this adverb is built from
- perceivethe verb at the root: to notice or become aware of
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。
perceptiblyadv
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In a perceptible manner; noticeably.
- "Where'd you get it?" demanded Limpet, perceptibly livening up for the first time since the curate's entrance.
- The five games left Botvinnik still one point back, still fighting but, it seemed, perceptibly tiring.
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。