spontaneously

Opportunities for learning occur spontaneously every day.

学习的机会每都会自而出现。

We decided spontaneously to board a train for Geneva.

我们自行决定搭乘去日内瓦的火车。

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

这些分子自形成的可能性有多？

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

遗传性白内障致病基因，实验动物模型是一个非常好的方式。

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

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。