1.Opportunities for learning occur spontaneously every day.

1.学习机会每天都会自然而然地出现。

2.We decided spontaneously to board a train for Geneva.

2.我们自行决定搭乘去日瓦。

3.What are the chances of these molecules springing spontaneously into existence?

3.这些分子自然形成可性有多大？

4.We found a recessive cataract mutation arose spontaneously in a KUNMING outbred mouse strain.

4.研究遗传性白病基因，实验动物模型是一个非常好方式。

5.I had never been spontaneously approached by a publisher and such condescension rather turned my head.

5.还从没有一个出版商主动来与我接洽，这种屈尊有点让我受宠若惊。