Opportunities for learning occur spontaneously every day.

学习的机每天都自然而然地出现。

We decided spontaneously to board a train for Geneva.

我们自行决定搭乘瓦的火车。

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

这些分子自然形成的可能性有多大？

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

研究遗传性障致病基因，实验动物模型是一个非常好的方式。

While methemoglobinemia clears spontaneously over several hours, hemolytic anemia may take several weeks to resolve.

高铁血红蛋在几个小时后自动消失，而溶血性贫血需要几个星期才能解除。

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。