spontaneously
[spɔnˈtenɪəslɪ]
adv.
自然地，自发地，不由自主地;
不禁;
油然;
例句:
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Usually a woman's breasts produce milk spontaneously after the birth.
女性的乳房通常在产后会自然泌乳。
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Sometimes the cord spontaneously untwists before treatment is provided.
来自BBC
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He was never spontaneously warm or friendly towards us.
他从未自然而然地对我们表示过热情或友好。
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As soon as the tremor passed, many people spontaneously arose and cheered.
震感刚一过去，很多人就自发地站起来欢呼。
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They don't just happen spontaneously in a vacuum.
来自SA
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Bills succeed or spontaneously combust at their very say-so.
来自WSJ