1·Many people spontaneously stood up and cheered.
许多人自发地站起来欢呼。
—— 《柯林斯英汉双解大词典》
2·It's whether a species has developed this ability spontaneously.
是一个物种是否自发地发展了这种能力。
3·People spontaneously create their own social webs to get their work done.
人们自发地创建他们自己的社会网来完成工作。
4·It did not matter if the researchers told them to make choices, or if it was a spontaneously made choice, or if making the choice had consequences or not.
是研究者要求他们作出决定、还是他们自发地进行选择；或者他们的选择是否有结果，这些都不重要。
5·Hair cannot suddenly or spontaneously change color.
头发不可能突然或自发地改变颜色。