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Moistness is the quality of being moist — how slightly wet a thing is, often in a pleasant or useful way. You can speak of the moistness of a cake, of soil, of air. Though actually, moisture is the word people reach for much more often. Moisture is the water itself, the wet stuff in the air or in the food. Moistness is more like a score: the state of being moist. In real talk that line gets blurry, and moisture often does both jobs. Moistness is correct, but it can sound a little stiff, like a lab note or a tasting sheet.
濕潤度、潮濕的程度。口語多半改說水分／濕氣（moisture）。
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。
moistnessnoun
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The property of being moist.
- Alway remember, that in wynter fleume increaſeth by reaſon of rayne and moyſtneſſe of that ſeaſon, alſo the length of nyghtes and moche reſte. And therfore in that tyme cholerike perſons, are beſt at eaſe, ſemblably are yonge men, but to olde men wynter is ennemye.
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obsoleteThat which moistens or makes damp or wet; exuding fluid; liquid in small quantity.
- The moistnesse which the roote of a tree suckes becomes a trunke, a leafe, and fruite: And the aire being but one, applied unto a trumpet, becommoth diverse in a thousand sorts of sounds.
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。