偶发

It was quite an accident.

这是一桩发的事件。

They have typical laboratory findings, including hypokalemia, metabolic alkalosis, hypomagnesemia, and hypocalciuria.

在此篇文章中，我们将报告三个病例：一是发性个案，另两位是姐弟。

A mutant, TS-N-121 was obtained by mutation and plate screening from a parent strain Mycobacterium fortuitum MF2 , which could transform sterol into androstanedione as the main product.

二酮的转化产生菌发分枝杆菌MF2出发,经变结合平板筛选,获得一株主要转化生产睾酮的突变株TS-N-121。