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Spontaneous describes something that happens naturally, suddenly, and without being planned in advance — a spontaneous decision to go on a trip, a spontaneous burst of laughter, or spontaneous applause that starts on its own without anyone leading it. It's generally a positive word, suggesting fun, freedom, and not overthinking things, though it can also describe events that simply happen on their own without an obvious planned cause, like spontaneous combustion, where something catches fire without an outside flame.
自發的、隨興的
組成From Latin 'sponte' (of one's own accord, willingly).
原始詞典資料6 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。
spontaneousadj/spɒnˈteɪ.ni.əs/
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Self-directed; happening or acting without external cause or instigation; proceeding from natural feeling, temperament, or momentary impulse.
- He made a spontaneous offer of help.
- Lady Bertram agreed to it all with a calm “Yes”; and at the end of a quarter of an hour’s silent consideration spontaneously observed, “Sir Thomas, I have been thinking—and I am very glad we took Fanny as we did, for now the others are away we feel the good of it.”
- 2
Done by one's own free choice, or without planning.
- YSL, as he is often called, is equally capable of casual, aristocratic cruelty and earthy, spontaneous tenderness, and when you study his face it can be hard to distinguish boredom from rapture.
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Controlled and directed internally; self-active; spontaneous movement characteristic of living things.
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Produced without being planted or without human cultivation or labor.
- He persisted in his design; and, because he would not make his wants known, actually subsisted for several days on hips, haws and sloes, and other spontaneous fruits which he gathered in the woods and fields.
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Sudden, without warning.
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Said or done without prior planning or prior writing.
- He made a spontaneous remarks in the court.
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。