Picture a knife going into a and coming out with a fat slice, or butter going onto that slice in a deep, generous layer. Thickly is the word for that amount: more of it, piled up, not spread out thin. Now stand back until the is a whole , and the same word describes trees standing shoulder to shoulder across it.
可以想成一把刀切進麵包，切下來的是厚厚一片；或者奶油抹上去，是滿滿深深的一層。thickly 講的就是那個份量：多、堆得起來、不是薄薄攤開。接著把鏡頭拉遠，麵包變成一整片山坡，同一個字就變成「樹一棵挨著一棵長滿整面」。
From the word’s history
Wiktionary gives Middle English thikly, thick plus the adverb ending -ly, which turns an adjective into the manner of doing something.
Wiktionary 記載這個字在中古英語就寫作 thikly，是 thick 加上副詞字尾 -ly。-ly 的作用是把形容詞變成「用那個方式」，像 quick→quickly。所以它一直就是「以很厚的方式」。
Wiktionary entry for thickly, packet source_ref kaikki:3f6f69a190036ae4:1026512684
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