spontaneous
/spɑnˈteɪniəs/
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adj. 自發的；自然的
- When the lost child was finally found, the crowd broke into spontaneous applause. 走失的孩子終於被找到時，群眾自發地鼓起掌來。
其他意思
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adj. 自發的, 自然的
Spontaneous acts are not planned or arranged, but are done because someone suddenly wants to do them.
- Diana's house was crowded with happy people whose spontaneous outbursts of song were accompanied by lively music
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